Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a13935045328d57…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 04:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3bb19ecd58fc8eec5ecfc384df76546 SHA-1: 9374462276869b054268907cc910cefae5a14c86 SHA-256: 8a13935045328d576121efbddff0274757e720b2b0e7e4f9d1480285abbbb364
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The primary purpose appears to be directing users to potentially harmful external sites, as evidenced by the embedded URLs like 'https://baarspo.ru/123?utm_term=autosys+job+scheduler+pdf'. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/123?utm_term=autosys+job+scheduler+pdf PDF link annotation
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/2252268.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/fheibjb/zusoxuzajifoxezuxu.pdfIn PDF document text
    • http://marketitaly.info/how_much_oil_for_champion_4000_generatoryj1fr.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/gij3Aii/3765655871.pdfIn PDF document text
    • http://proita.space/xovonopatugejapag3jra.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/7795754.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/8765627.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/ib5gghc/essentials_of_pathophysiology.pdfIn PDF document text
    • http://milano-moda.space/japowotizijamowutim54my.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/dirapib_fuxiz.pdfIn PDF document text
    • http://look-hotel.com/rozowewananobujoluulb0.pdfIn PDF document text
    • http://littlenat.space/856475639923g4zi.pdfIn PDF document text
    • https://cdn.sqhk.co/wufaluvete/hb1jcgi/epic_games_launcher_crashing_mac_2020.pdfIn PDF document text
    • http://probmake12.xyz/63884490416xy7ds.pdfIn PDF document text
    • https://cdn.sqhk.co/xozakatupab/EjcO6hi/70734393134.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/ms_word_2007_letterhead_templatejepa0.pdfIn PDF document text
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/robogapuvapitab-mafosegem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_b431ddfc87ac4fb680e786f15efc4ec6.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_9cccc7dc4979455eaee56dec4dabe1e7.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_852c7b4a35b049ffa16c734e9779247c.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_4e3880c1941a4b388ce5fd67ac52ae4d.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_94459ce072c74af4b50f63d7d85b4378.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_ca46ad03534c4d028156c31e7393b0e1.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_9f27be784e374368ae5cb958f9837eb1.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_34ca447981d94bcf8e5e0c3d952f99a5.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5340 bytes
SHA-256: 9dd2c5e7608f16e0700a067a63104b194022fb228aa9c245e5c9421e2c5f3433
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10728 bytes
SHA-256: d36e26d4d65f6aabfebcc867dbffe74bd357f7860f46d03838bb3e9b2ac04345

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