Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2f312531920e91…

MALICIOUS

PDF

81.6 KB Created: 2021-02-06 16:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac0cffd43874dff3e7656f07c394b933 SHA-1: 90995bbca11f94dd4a7402c8c323eda0af7b715e SHA-256: dd2f312531920e913a7885eb3075410a2fedb85bf960ab27af4c5126ce94b0e1
176 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate the phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/aws?utm_term=iphone+camera+scanner+pdf PDF link annotation
    • http://foyou.store/lagakoxotsmei4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd2abb6850ee.pdfIn PDF document text
    • http://moresukko.ru/80394180954erinj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fd0e92f4cae3.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/tuvuvone_voxetojimewobus.pdfIn PDF document text
    • http://vizit.store/thanksgiving_menu_worksheetv5rzq.pdfIn PDF document text
    • http://bigpleasure.ru/92307766152hccvv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fd9c59c4ff0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446174/normal_600502f23a9a8.pdfIn PDF document text
    • http://scm03.ru/zukagomopevonixabaromizuwe8he.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/tebekojomiriseji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/bellanca_scout_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/92532495214.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/airtel_mitra_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/birotezapedafem.pdfIn PDF document text
    • http://wepukuxazej.rf.gd/pusiluzepaxebu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012053.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12053 17104 bytes
SHA-256: 847abe018cb2e93a0f3c0c1088006126fca8df043734480635fa77f7db79f839
font_00_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 5300 bytes
SHA-256: 50b19776cca0871bc41e98f0d7477d780d8a1aad3dc923db8e673423741ae3eb
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10780 bytes
SHA-256: b5abb3b1cde3ef1b593c313bf66f8810f6ebdf161e23f28f2f201373ef1c62a5

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