Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d73dbfd63d7a89…

MALICIOUS

PDF

109.2 KB Created: 2021-04-02 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c8c59185e6668376622270d4ad4841f SHA-1: 4fd87122f6489f0d1babdbc0fc6215fcf438531e SHA-256: 74d73dbfd63d7a89ca9a6bc8e0cd248a4b7e73c5b8ad98aff75a4d4d9e736d74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, https://botokaw.ru/wix?keyword=binary+multiplication+rules, is likely part of this malicious infrastructure. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings indicate a phishing or spamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/wix?keyword=binary+multiplication+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366009/normal_600b4ba32a507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_60620573d91e0.pdfIn PDF document text
    • http://vetozadep.mywebcommunity.org/cours_assurance_automobile.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/pinodonor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_60000e9ab5d5b.pdfIn PDF document text
    • http://bobimesufapi.iblogger.org/fiwetokasaruxoko.pdfIn PDF document text
    • http://kilewigi.iblogger.org/blank_political_map_of_europe_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ed85415a-30cd-4e7b-87ca-481757f856d3/bubimewe.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_776327d4c7e647e8a91602972e9f8dec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab8aac1-17ff-471e-9f80-0b4a0a74e063/how_much_is_one_percent_of_facebook_worth.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_ee43d8e8986d42bfbe08878abefc074b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea2497d-9a13-4fd6-ae93-38deb1e49b1c/dosezavomajit.pdfIn PDF document text
    • http://malinaliwul.epizy.com/liftmaster_security_plus_2.0_error_codes.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_48964305c7bd4cc5abc2d932b9d6e3ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae2e33b-7272-460e-b6f1-f5d8509fe299/98827873504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858d7821-e706-418d-9941-89ed1d5c5a3e/livipagotojomosidinog.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_1d39cdb8822a4354adee984d3df4a6d6.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_256cbdf71d7843fe9da51bcb0b7caa2c.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_f01dba9389c440c9963b10e618e58533.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_302ac6eac9b543b9ad9817a6ecdb95fd.pdf?index=trueIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/jezadugesaruxadimuvoku.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/bilingual_books_spanish_english_for_adults.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/wojitatowem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 5112 bytes
SHA-256: d23743a30705d9658c3f8ca0580f0552b6183e9a26383ca71af6bbeb60e6af7a
font_01_sfnt_off00015661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15661 12532 bytes
SHA-256: 0671e7bae512bf1d9553f01bd8b4ce246c1d44fc1bd1c096c6a8584a4fb0ad28
font_02_sfnt_off00018194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18194 16724 bytes
SHA-256: 51ceda9acd795e4ac93c3bf3979537e6c444acd57c3993e8d070d57c5d534889
font_03_sfnt_off000198f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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