Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8d428aa0ad864e…

MALICIOUS

PDF

83.7 KB Created: 2021-06-05 18:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcf3e0d00dadfff789911ef0ad71ac0c SHA-1: 3289c9b9f28c224de437d02d5d701d9152805463 SHA-256: 5a8d428aa0ad864e73e1374ad7b9bcdb6d13ce872b1d27f393138740353c99bf
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. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute malicious content or phish users. The presence of 'Chrome cleanup tool' in the document body suggests a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://jottigo.ru/123?utm_term=chrome+cleanup+tool PDF link annotation
    • https://pimelitapata.weebly.com/uploads/1/3/1/4/131454500/jiwumuw_bilidudapopono_rixoliduba_busuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_6045561525710.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/nejaxifaweniw_noxijupok_vusijuz.pdfIn PDF document text
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/2725aa62033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_5fd3063adafe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_60414e0d7bfca.pdfIn PDF document text
    • https://tatagufok.weebly.com/uploads/1/3/4/6/134692967/8878166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601951c21b033.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/pixizezifa.pdfIn PDF document text
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/roneganade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_600d36052fadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_6069f91d4e675.pdfIn PDF document text
    • https://kewatedodi.weebly.com/uploads/1/3/0/7/130776291/afe59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd38d9017812.pdfIn PDF document text
    • https://piwoweral.weebly.com/uploads/1/3/1/8/131856495/kubape-sirogotaze-xafurugarajusa.pdfIn PDF document text
    • https://piziwola.weebly.com/uploads/1/3/1/3/131382430/nodawo.pdfIn PDF document text
    • https://fovofenat.weebly.com/uploads/1/3/4/4/134489119/6089209.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/wefipokutepizatude.pdfIn PDF document text
    • https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/3300872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fceeb0740a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5fd1a0c970d2f.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/f7232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5ff1d164635be.pdfIn PDF document text
    • https://karadirivesu.weebly.com/uploads/1/3/1/4/131407010/fimozoloxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e816dd6-be46-4be1-911a-4b11881221ac/venuvutamolevejeduxuzesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8242806-ac6a-4a77-b249-80cbc2af69e9/70302981308.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_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 4900 bytes
SHA-256: 6e386e62ffec6dcffa8c23180786f07b5f5e8a1a9866127b411c4b0989c8a685
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 11332 bytes
SHA-256: 1f4ba04038fc05edb571ec05cdf01c81b02a4ae3a37d64d7c130a085fd5a7475