Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a999461fe807ec…

MALICIOUS

PDF

74.7 KB Created: 2021-05-21 10:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5120ce0b71500664006a2ed33677f92b SHA-1: 74b3ab706d0a9a6fe8d65cf269c6982ff767428f SHA-256: f6a999461fe807ec12fe055f2c03d415e800b734f1117f55cd1274127e8a165a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with 30 external links, many pointing to disposable hosting, suggesting a phishing or SEO manipulation scheme. One of the primary URLs is https://soxebez.ru/strik?utm_term=how+to+use+simply+smooth+keratin+treatment, which is likely part of the lure. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://soxebez.ru/strik?utm_term=how+to+use+simply+smooth+keratin+treatment PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/lakepanug-bewerejilawab.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/3125096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603c015883bef.pdfIn PDF document text
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/4611669.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/c2f9187e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5fdd66e3e3446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff17fc970d5e.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/ce1d0f07-508e-4f09-89f0-f8fc4f1e8c3b/how_to_set_up_comcast_xr2_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de011b2-b36d-4e52-9197-cf38d8947050/wonabezig.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/33523938343.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/44531128739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4972c3ed-6fd1-4752-a9a9-a5991b207f09/zoomer_kitty_instruction_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970326fb-e247-445c-a349-e9512619d0d1/unity_stock_ipo_date.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/72153975016.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/free_residential_lease_agreement_template_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c76e7ea-4178-4d96-b7bb-5ff2fafeaa36/irobot_roomba_e5_5150_black_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/politics_for_beginners_review.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/virgil_aeneid_robert_fagles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaa813f-60e8-4a66-ad5c-793a69c8df17/zibizurugigumefipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684d0812-d852-491e-aa60-8f170c2e926f/what_size_wiper_blades_for_2013_honda_odyssey.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/standard_enthalpy_change_of_combustion_definition.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5280 bytes
SHA-256: e2c2fd1494e527edcb35db40ae449796d223319d4cb6bd747cae1693fbb57ee3
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10996 bytes
SHA-256: 7991b59af6d4fc8fbf05d76283239fc8e0cffeb1b0869d00b42a42c535b7ff99