Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a8a1841fb20f55…

MALICIOUS

PDF

70.1 KB Created: 2020-12-03 23:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 95cfacf47fa2d9168139ad1d6a8abca3 SHA-1: 10d9d63b05c6409aa19de37b9c318e02ac7f4a0f SHA-256: 87a8a1841fb20f553d1c440f9cb6303062749198ac55f264c97ab6e9586b5f50
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'quote template in word'. The presence of numerous external links, many pointing to disposable hosting, indicates a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=quote+template+in+word In PDF document text
    • https://jefelowomiwit.weebly.com/uploads/1/3/4/5/134599681/pifiruzumej_ferojekeje_vezedimese_jojisi.pdfIn PDF document text
    • https://wekonopu.weebly.com/uploads/1/3/4/8/134848362/geridozadatilosoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5fc5f749daf4b.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bf0768bc9a84a.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/7996174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/96177669-3311-487a-903d-2919cefada2d/bonjour_tristesse_chapter_5_summary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eab716f6d44b07bedc8b/t/5fc56d513485235c867df44e/1606774100282/tracing_light_box_joanns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fdf2c4-f596-409f-a402-e7f13fa042ba/dijopexotelubanerarikibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efb08a2-8d68-42de-8f50-7a464c923c5b/billetera_movil_banpro_bloqueada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14613b22-d118-4701-8dfb-b835c692c78f/49628531416.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/dapowiril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe78ffc-ba6f-43ab-aa11-99213623e118/7445326320.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 4964 bytes
SHA-256: 6e57c8332be15a5bc37fddbc81795b96b024eb07449ef59ad7bee988095acc76
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 10188 bytes
SHA-256: c3c04f8843701f30eadae72dcf14c83e6846df4bc4d5fb252314e6655753adab
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361