Malicious PDF — malware analysis report

Static analysis result for SHA-256 5793af7086ddf8f2…

MALICIOUS

PDF

73.2 KB Created: 2021-03-22 10:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5f9adcf4a71c8902a2953bc3c3f9c55 SHA-1: 73176df7a35047d922e77cb90df049b6d16f37ef SHA-256: 5793af7086ddf8f2e3c311c40434a9dd1f33545a7f2fb9fcb9997f5851c1ead3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=stick+wars+strategy+guide PDF link annotation
    • https://cdn.sqhk.co/nawakema/zjfbMvE/mulujisopitem.pdfIn PDF document text
    • http://peludofnor.fun/totogitijuwujofesivasati7kib.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/aggbhgi/ahlstrom_munksjo_de_pere.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/jieyjhh/6437013056.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/hjdgiU8/mizuwaviga.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/eicggG4/flixster_redeem_uv.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Sgeidgf/51301474584.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/ijaT5ha/coupons_for_walmart_grocery.pdfIn PDF document text
    • https://cdn.sqhk.co/gofuzurafano/ijgehdv/50514051036.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/Vjgkvge/phone_interview_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_68170b169cf245af86f3e52d615c0326.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_a6ab56dd533c4768b19f644900c1d084.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_1ab86e55808f460b83550c35fd515dc8.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_c57962ea6f31442ba4173634808ae179.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_be97a114ca1740e0b0ea8d3e46492382.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5436 bytes
SHA-256: 731e9c2a7011f3a557d71295816260a544cd6dfc49051ec38ae884941b229416
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 10440 bytes
SHA-256: f3035c5dbec6dc2a221da43319d9727409659a5f66211216d3af6b0e3cb46f53

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