Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce2a559aec1f9a2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-21 00:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e32731504fd4642c336c4e85cd800ed7 SHA-1: d7e74ae51d745438b4bbee74c0d014a91e83e4ed SHA-256: bce2a559aec1f9a247fbe384002768c12a7eabab176bf0d693161aaad5d24c9a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. Several of these URLs point to potentially untrusted domains and are likely used to distribute further malicious content or engage in SEO manipulation. The presence of embedded URLs and the PDF structure suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=what+lives+in+freshwater PDF link annotation
    • https://cdn.sqhk.co/teforoke/jjyTOhi/kikejalifaw.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/how_to_make_the_best_paper_plane_with_a4_paper.pdfIn PDF document text
    • http://instas.site/light_is_like_water_magical_realismpai7b.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/f4IDYTn/66496563036.pdfIn PDF document text
    • http://zvezdasevera.online/social_psychology_david_myers8hz4b.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/givafuwegujivelet.pdfIn PDF document text
    • https://jazedase.weebly.com/uploads/1/3/3/9/133997310/jelek.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/sagabomab.pdfIn PDF document text
    • http://verification-help.com/zegekagaxuliguvajevenixchye4.pdfIn PDF document text
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/goditik.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/WIpgdFv/scotland_politics_news_now.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/zozuwavu.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/lobokorijugaje.pdfIn PDF document text
    • http://xozonline.ru/8204381779hacvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvarelo/fevuvabifoleb.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_b5ff9282225c47c9a15d10aa510eb61c.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_9bb71693207b4d14ab06873195f1008b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/algebra_word_problems_worksheet.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_834cb3533d5848d98d6f4922f1dd87af.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_da3fccbdbb624241886a5d26f4c662f9.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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5020 bytes
SHA-256: 76456d8113f9d4eeb5851cce692fd768573935ecaed822052b672b9c5b3cb314
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 11004 bytes
SHA-256: ee579c4860139a5cfa1400173cfb22cc11e910d2689e5de5c9e3fa03afb9b56e