Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf7bd10b0f3ccd4…

MALICIOUS

PDF

89.4 KB Created: 2021-05-17 20:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 664f29ae5f711b50329d49c73d433353 SHA-1: 7c4b4a37c54f1277256e03e296588532c5c3fb5f SHA-256: dcf7bd10b0f3ccd44d03c786952d3fe5d98f27d3f0305978c6896ab66d638133
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/strik?utm_term=norton+anthology+of+american+literature+table+of+contents PDF link annotation
    • https://cdn.sqhk.co/sobexofap/2iaqqhc/the_sims_freeplay_hack_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/WhdsxzG/towizix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fd118d17eae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_603919cd67b3c.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/76623973436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_604aa089a6a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_6010ee6d142c9.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hhON4gd/lagimitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fdf10412cb70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_60047ee01f7db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407060/normal_5fd04bca231ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fdc4e8639997.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/blaine_county_lspdfr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_7644a4fad5c34b67b46d6590318cd712.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9daf8ae8-f514-45f7-888b-358b2dfc1ae4/15199827808.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_e930dfb853da4191949e943f015adfc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/642b9258-f564-44f6-babe-5becebad8fb1/xibivivibuja.pdfIn PDF document text
    • http://nobapizasiwe.myartsonline.com/rehabilitacja_po_endoprotezie_stawu_biodrowego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff04bac-0374-4ab6-bab8-d14d0be7482b/a_peaceful_woman_carries_a_gun_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f157b9d3-b9b4-4b96-9b5c-3bea0d2ff2ad/burger_king_fries_dairy_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86702ff-dc40-4e1b-90e2-fc803cafd91b/28231449816.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_56be237614fa451991349987ee33266e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 5504 bytes
SHA-256: 4eba7389803d8979a8fa8aa77cbfbe5bb386fbe6333414e1202ce86c19cffd04
font_01_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 10768 bytes
SHA-256: d1af1ebc955a57de19711b4152d605e927d4157e6dab6e625530d999b914179b
font_02_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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