Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deab1577d73e0e2…

MALICIOUS

PDF

80.0 KB Created: 2021-06-03 13:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 69149943b23d0952154d4486e1b30476 SHA-1: eff920a39291129268c84c1d1f7d3a1c04a916f1 SHA-256: 8deab1577d73e0e20d88510bd8dc487a8bf91b4c64bb48b8bccf2228d1bde181
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, which is indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm heuristic point towards an attempt to manipulate search engine results or host malicious content.

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://wastran.ru/pbw?utm_term=liv+and+maddie+andie+dad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378165/normal_600e71e28ce4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffa24c149d46.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/5c96ae736a65.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/radiwe-rebes.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/431089.pdfIn PDF document text
    • https://laderorigeridag.weebly.com/uploads/1/3/4/3/134309938/7544859.pdfIn PDF document text
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/7027863.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/6490290.pdfIn PDF document text
    • https://wizuxasu.weebly.com/uploads/1/3/4/8/134876367/sanipagizo-dureni-wawogeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5fe421c98f012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajivapesi.pbworks.com/f/how_to_check_mk_watch_original.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422652/tojigewujagajij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df906be8-0e58-4b2c-b878-8bf6cd3e3ac8/canon_rebel_t5_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1477707-df7b-49dd-95d8-596eb0f15621/fupivasidapasekobepoxa.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/31870553832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50cc0fb5-fce7-4c0e-bc86-e117de1652fb/60787827222.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144436311/introduccion_a_la_microbiologia_tortora_12_edicion_descargar.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414747/gogizofe.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144544512/black_swan_green_souvenirs_summary.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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 4668 bytes
SHA-256: 00618cc49c9fd55d3c851233c1b4c318aeaf0a43f8ab15db5d7fefeef64764e9
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10772 bytes
SHA-256: 20cf795c516ae67c05d6327ffb68155a4b48f3e3fa5f282e9dc7f4c2ee58d798