Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f5649b6b3715c…

MALICIOUS

PDF

122.1 KB Created: 2021-06-05 18:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 13509676c93e042e7c7bc6b567ec72ad SHA-1: 90ecc6e7ba53bf2d59c94cee643026991d8e86a9 SHA-256: 916f5649b6b3715cc5ead260c6300d3b2c3bc40913709f46e4d2e6e0b53018f3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary URL, 'https://drafthe.ru/pbw?utm_term=what+is+the+best+mbti+test', is presented as a search result, likely to trick users into clicking. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/pbw?utm_term=what+is+the+best+mbti+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd8150063aab.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/tabosigexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_603838e443233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_604ef4696fdf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_606da250eac22.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/fdd07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_60254b8bd6036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fcecccfbb59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60659f61100b3.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/6781560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_600aee0d6e580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fde929d89f6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_60073e61ef880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_606796f54e863.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369160/normal_60b739338a268.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/fosaliwu_togupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144414921/91451976792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0756d673-5dcb-44eb-8709-04a413e592c5/xovaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bf8ffa-e75e-480c-a871-7de1477013dd/86468888271.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/mijelubutogifetulimonoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737df934-f46e-4299-8ea6-ba535e89fd20/58486565775.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144419739/joined_up_writing_printable_sheets.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/gonowabifen.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_off0001a1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B8 4948 bytes
SHA-256: 391bcc4b7c3872655d5aae7dfa06708b518f85b285af10e975e5373b6a9077ca
font_01_sfnt_off0001b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B276 11828 bytes
SHA-256: 7bed23773dded23bfbe627fa80c84862bf6b33198740cac05eaf2731ca417c4f