Malicious PDF — malware analysis report

Static analysis result for SHA-256 3999c16e0785ca86…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 17:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b5e01c4b2552da0a03a69ec2dc6db2a SHA-1: 524c52e43c0469a7235add0a53eefdddcc7c9e0a SHA-256: 3999c16e0785ca86baf83a60daab4d5f92cd8d64db15ef4b644cc51d830f08e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=vehicle+information+uk+50p PDF link annotation
    • http://labifovejes.mypressonline.com/7288586375.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/622e9cd324638f.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/7PNhhic/72355128055.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/buzaloma.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/3a052c3d6c8.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/gfhb4CQ/xovexepidukexazovonov.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/6jfRgjy/warcraft_gameplay_ps4.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/91691030621.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/vixadebapojuzup_rokibuveg_xulalumej.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/pinebalezekev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_6c8dd57f8ab345208c4f71fdaaf68cff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6e56c4-4743-49ed-af07-c578de47f79e/first_alert_co_detector_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdb6068-d004-4193-b50f-57afcfcb4b80/ncert_grade_10_english_textbook.pdfIn PDF document text
    • http://livirava.atwebpages.com/is_a_2012_hyundai_sonata_hybrid_a_good_car.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_c3bc790054ce4ef4985337a6904631c4.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_80061b5382fe40cab3b5c15c3948419a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38355b9-c477-47db-a5e7-a8021b21b50f/79821064705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c636923-2f3f-4096-ba6c-7b7d25b7fe39/muzorimasejudojom.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_45e4029174954be39158e5792d548dfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d990e6-ff1f-4613-94af-f1f047e30eec/how_to_reduce_metabolic_acidosis.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 5372 bytes
SHA-256: f2b63dbd537ca9d6f094df82fdd05e6a4b13346a15451da202e504404efec1f8
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 11508 bytes
SHA-256: aaa15c9f7fcdab22dba07fd2834bc6e7561a2a19898f6d4689f21e8f91bebb85

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