Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7ff0d42f34aca8…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 10:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df8b1609d1902d02d8de1d996df2b494 SHA-1: 24402f2823b212e2ae8f1a4fd2b876dc4faf669f SHA-256: 8c7ff0d42f34aca838e71dbcd80f1364e69533647f16a60cb241eff2d8805204
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector for search terms. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+much+does+a+senior+software+engineer+make+at+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5fef626e026ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_60010f4177828.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/711c8e7d-c515-423a-be30-528f09027bc0/donum.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_f090d6daf7054c2b91a14447cf981979.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/english_to_bangla_vocabulary_file.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/e._coli_transformation_heat_shock_protocol.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_3b7f2538c6914964905ae54fb9db0dbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8546d7cf-6a27-4043-b3b5-66eb38509ccf/roomba_780_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aa6036-95d6-48e9-870d-b14d16fb1eb5/57373319037.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_20a351330c484ffc88cdbdc1c20f24db.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_6c3c7602de88432a927181fa7928095a.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_3fd15d7b9de541f88b76207346e4a07d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b3c3cb-6d45-4a13-a48b-8c9a05127989/gugajorifeparuxakib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7144cf4-84b6-496d-a2b5-65ab98c54be3/75795550856.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/9656375545.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/25354222450.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_5fff021bd9bf4ff8b617e6b4c32bd9ee.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_3c1a6183edc74e889efa035758729b11.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_4bd2dba7ba544af1aa58f47b29476277.pdf?index=trueIn PDF document text
    • http://saluwagasa.onlinewebshop.net/interesting_essay_topics_for_middle_school.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5572 bytes
SHA-256: a770259e891490b7a2faf31fe2f3e180c3dd36a6d8609a39cf0a84269d6f69f4
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 11096 bytes
SHA-256: adfa32f8cfbaafd15ed79a0ddbe847a0d732c0bc4b29137ba0dc9b379daebfe8