Malicious PDF — malware analysis report

Static analysis result for SHA-256 218ba1e1cd29248d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-21 02:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 955c11793aed4b7e24a4ebe9a9147808 SHA-1: a2018a0a3054392b25139ec8c54dfa9cfbe31fb5 SHA-256: 218ba1e1cd29248d89e6b914f64a19ea7b8b7199ae5504bcc9a1953612d5daba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary URL points to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=how+to+say+my+god+in+hebrew PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481847/normal_603ed458d6203.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/juhiYcE/sword_hit_sound_effect.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ff06e44dc0c4.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/4hhzhv6/uk_finance_push_payment_fraud.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/ajhhgRz/xodabagefijezemokidil.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/hbjcsNc/jufesekokutuwivami.pdfIn PDF document text
    • https://mejibafizafev.weebly.com/uploads/1/3/4/0/134042836/wibobeb-dudef-zerujemixupama-xuxofano.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/rfWgi0b/alchemy_of_air_timeline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6029ca3f31268.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/merafokewa_fifakukeme_tawuwulixafavu_jeraredi.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/pazuzanaxa_fabitoluzuxep_sigujajamapunev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipegolujodik.epizy.com/jutakofimakaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90d11d1-97ba-4969-9f15-0412eb8738a7/62569206796.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_c66d50a090334e4e8f76184846f35bce.pdf?index=trueIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_e4bef9007e534198bbdc5be82feecf5f.pdf?index=trueIn PDF document text
    • http://korudowewufo.epizy.com/auditing_and_assurance_principles_2020_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb85ce7-e098-4f04-9dad-cc3352f7fae2/18018636086.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_5691819c7da240cb89bbadf4ba996f2d.pdf?index=trueIn PDF document text
    • http://makowadoka.epizy.com/calculus_early_transcendentals_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf7a2ec-2f2a-4bd1-9dbc-d5d12b99db42/jifurawoxajagubutake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0b0b19-cf76-4d6f-b6c4-c7300124314f/capitalization_punctuation_worksheets_2nd_grade.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_4cd78be67adc428fbee06c9c4521b2a3.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8fa528b4fb374e63b4b8189e2feeaddf.pdf?index=trueIn PDF document text
    • http://molilaxe.epizy.com/ravuvinunizokoki.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5504 bytes
SHA-256: faca0b1fbbca908462d7f79fcd6bb70a287d1348012469e8ec569ae499206d9e
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 11152 bytes
SHA-256: 5b8379ac70a28c1a5c7d456520165966b9eeffe8365358dfda6264ae494e86da

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