Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17bc70c0616003f…

MALICIOUS

PDF

70.7 KB Created: 2021-03-11 07:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 016393fcfe0b8b08121c59e2ebae5e28 SHA-1: 91e041ca5e02ed1b22ca8f94d51faf7f9c173e2e SHA-256: b17bc70c0616003fb8a08bfa53d252c63566cff9f8aad5d0bca2a4dcfc25424e
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 0.9996

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://maypoin.ru/wix?keyword=mitosis+coloring+activity+answer+key PDF link annotation
    • http://bagesopabiwub.scienceontheweb.net/lumegigemuvupazadoxa.pdfIn PDF document text
    • http://koprovk.xyz/tadumijotetejazuxudn7gt0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_60012d110e5dd.pdfIn PDF document text
    • http://kyrgyztours.com/86875630169qzod8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_601957a70cb60.pdfIn PDF document text
    • http://kvyovk.xyz/jedavidupojigoxez7y6vy.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/can_you_still_buy_a_wii_in_2020.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/2505774.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/2064ddded730d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_601b67ff0b8f0.pdfIn PDF document text
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/bigapebofipud-zijakisazoveliv-putejavaxizujo-dexiz.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/81077664f9f4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_6006bb614d08e.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/modal_verb_conversation_listening.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_d41bd7d7c11d4d7bbcb1fbc021af6c5e.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_63216d3cd9624678bdf7672efe61e693.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_77a6cfdacb4340509cccbc7e04511212.pdf?index=trueIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_0e4c5e2249314902a0f672f5ebfb9bf5.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_b9e288d6a13a4da3a1ba11b6da2a5671.pdf?index=trueIn PDF document text
    • http://rowesotinik.rf.gd/43833771248.pdfIn PDF document text
    • http://xewaditina.epizy.com/vekojite.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 5292 bytes
SHA-256: 188af2d18b4cb4996ff5bc2fd6cf207c4e99da742fcb4a3f7d38d5e8d2397447
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 9852 bytes
SHA-256: 0aab53572f29418f345ab8e5f7fe2d140e6e7c4330fa2781c5e2759d1c69527b

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