Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4d372fbe0e9078…

MALICIOUS

PDF

131.6 KB Created: 2021-02-20 21:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 95e937a4b2193e233754bfcad3ba413c SHA-1: 27aaa0e157f2206f84611cfc4e60a46d2ce05e4f SHA-256: db4d372fbe0e9078e22c05d56c47e5ada97a45de6c26abbdd62ee0955d816c0a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with link farms and SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://jottigo.ru/wb?keyword=where PDF link annotation
    • https://cdn.sqhk.co/xajamenujo/jvqFn3P/mefonuluzowuxivakigokufe.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/devas_fodekuxotuz.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/halFPDu/kopuxoxexom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_60084966cb2fa.pdfIn PDF document text
    • http://websecurer.tech/computer_network_interview_questions_and_answers_for_freshersofmdg.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/KMSVLjb/13195318517.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/4YYGjdX/digicel_call_international_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366042/normal_600300cf3957b.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Umge1N4/dinosaur_bubble_blower_instructions.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/e49278cb0c8f2c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fdf19f4e4b34.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/nokepibi_masidorujetu_xudaxefata_renol.pdfIn PDF document text
    • https://fixojifuxupelo.weebly.com/uploads/1/3/0/8/130814076/6738296.pdfIn PDF document text
    • http://habirovradik.ru/lineare_gleichungen_mit_lsungen1o224.pdfIn PDF document text
    • http://aazzzry.space/serway_physics_for_scientists_and_envb89t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_60255273861ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fde29266f7a7.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://s3.amazonaws.com/zerepuzuze/padusatenepelutoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/16074063513.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/division_of_decimals_with_models_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/how_to_start_an_essay_about_a_book_example.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00012142.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12142 42988 bytes
SHA-256: 060563f5f875287467a58e218dc1da119c746010faa003eaae4cf4f7c48f872c
font_01_sfnt_off0001a53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A53E 5076 bytes
SHA-256: dbf93d27033600380b580fe698bd4b236dfd21158bcf825b61d89a0c769d43b7
font_02_sfnt_off0001b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B649 5068 bytes
SHA-256: 25dbcb0b30a2000612c313911186f3271a877fd4ada3ef6de8d1653f274b4ff3
font_03_sfnt_off0001c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8F8 12476 bytes
SHA-256: cba7305e22c9d57a9a8305f1161193e61496de19c087ef3074c4233328fead2b
font_04_sfnt_off0001f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1D2 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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