Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0f41644f7d20df…

MALICIOUS

PDF

82.7 KB Created: 2021-02-23 22:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: bc4eeaaa449ae155604c24ff13051d3e SHA-1: 70614a62df345c1c67ed7a6c060b8cecebce6ef2 SHA-256: ef0f41644f7d20df4991475b3ec5abe4f510734961fa7168b99b9a1c70bda696
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm or SEO manipulation. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=programming+for+dummies+python PDF link annotation
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/4143677.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/3635753.pdfIn PDF document text
    • https://tajidirubizev.weebly.com/uploads/1/3/0/7/130739153/0c59b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fec5d108ba5f.pdfIn PDF document text
    • http://save50.pro/tededujisukugekec63t5.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/vekarotuba_walaxakifosokom_rinagoxopa.pdfIn PDF document text
    • https://famofupogatom.weebly.com/uploads/1/3/0/7/130739443/jijere_midod_zurepufoliwin_niwisugololonif.pdfIn PDF document text
    • https://zexamaginususu.weebly.com/uploads/1/3/4/6/134686515/gunajuvizan.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/6268319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_60080225e614e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477878/normal_60205698d2c1c.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/a6c2fe139c73f8.pdfIn PDF document text
    • http://limecash.xyz/3146338328491mc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fec021102830.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/likerajatob/59724261597.pdfIn PDF document text
    • http://juninowixa.epizy.com/what_to_write_in_a_time_capsule_letter_to_your_child.pdfIn PDF document text
    • http://sumoguvovubipil.epizy.com/pavefamipaxawaxetulunano.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/ccda_full_form.pdfIn PDF document text
    • http://pikididubemet.epizy.com/94891165775.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/55669064067.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/fusup.pdfIn PDF document text
    • http://bopebewi.epizy.com/professional_clearance_letter_template_icaew.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_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 5528 bytes
SHA-256: 6eb2bf6513c6f655eb512bfa39a6ea16fd50bc81765af9457c5f6cf1964d86a1
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 11136 bytes
SHA-256: 0b43be40897e628f278ae1a0a74e02a6ea49861d193c0996d9e269833fea3987

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