Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56ef98020a2fbb6…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 21:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aa2d8b4a30b3ade6b71ac9747b6e4333 SHA-1: b03903e32fd391ed063247cc78dd843969e86663 SHA-256: a56ef98020a2fbb6ee9fec13e2731aee8f13e0840152be7613af37c85d1a1360
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=solving+quadratic+equations+graphically+ppt+tes PDF link annotation
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/nuneb-giwolagene.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/jotileban.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/3502649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_5ff2974f9732b.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/porizezegiwomob-tuxob.pdfIn PDF document text
    • http://jinitevuwug.iblogger.org/eau_guidelines_testicular_cancer_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_600c0b7456b85.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/3197b39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_a93e61f5af284c2397a6f95c9e7782c9.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_fdc35eee7f30421f8b2eed42104bc7ca.pdf?index=trueIn PDF document text
    • http://nifimemewiz.epizy.com/40177819318.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_98bf5d152af245f7af0c84d7b0a35211.pdf?index=trueIn PDF document text
    • http://lowazuxakosilal.epizy.com/gafuripij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d55352-78d6-4f97-8482-6fdffad11fc6/timivubumuwufelemudumod.pdfIn PDF document text
    • http://peluxatem.epizy.com/xudodudovaxigevaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2360db5-2db9-4baa-8c9a-3e98e6ac7e18/basic_physics_problems.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_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 5728 bytes
SHA-256: ac300f77ddc227e8a480c9c75873a63d527bbb1d8efb6eb995d4b41d9ae7cfb9
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 11628 bytes
SHA-256: a8683eed9b1573ea3ac4f9e38f50bb0d9bd01118b34138fb7a4e7017bf876177

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