Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b08046534e9eba…

MALICIOUS

PDF

74.2 KB Created: 2021-04-20 06:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9ad63eccb75f369dec7790dd5f2cc946 SHA-1: d7bd28ef0f77170e54ded90e5bf8d18fe858cff4 SHA-256: a5b08046534e9eba487a37bf72910b24b32b9020b5be5b4361d9f840fc694d42
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. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=what+are+sensory+receptor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417670/normal_603b306351234.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hjibY8n/xuzizelelifajoju.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/ChfUAij/name_creator_for_pubg_pro_mod.pdfIn PDF document text
    • http://velasibab.iblogger.org/zufurarugipokutidoxupal.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/busixopatijud_zewuzilijufar_kinobuforawunav_kazinivoro.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/nulazoragekawumujoma.pdfIn PDF document text
    • http://tonagruz.ru/xegafilawitcmbqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5fe29b6f2be0c.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/hrNzkdY/free_printable_spelling_test_template_20_words.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fd2e0147da49.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/JiiN7hd/naluwisag.pdfIn PDF document text
    • http://digitalmedialit.com/22685788968mm82g.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/junijudex-tiwikukexeza-zijipuvade-gijezenurarixak.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/cwligii/glock_43x_spec_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wukopojenava/AgehixU/kumuponidokupibixizog.pdfIn PDF document text
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/teberag_vuvake_xuwer.pdfIn PDF document text
    • http://numupizor.22web.org/ieee_829_test_plan_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogolozumer.epizy.com/85979318868.pdfIn PDF document text
    • http://golujaxi.epizy.com/leluzenimujelabufakovax.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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5104 bytes
SHA-256: 9414f660e521d58fa7fb6066609d4ec45fc96c6d23f2590dfc069dc802d912f3
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10192 bytes
SHA-256: cc682ac7c85f0dfe375dd52f0292b3c40fc133a0158fc14d622e4cad34f846bf

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