Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ee55d6965f46c9…

MALICIOUS

PDF

71.9 KB Created: 2021-06-12 00:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f9c996f57dd90575cc424e299754cdc1 SHA-1: 11837b741462bf7a714f850b15a3e786cffac69c SHA-256: b5ee55d6965f46c9d03337a64291779b0113d8c0b6b0d73af5c477b89abaf63a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded URLs, such as 'https://queure.ru/pbw?utm_term=bluecoat+proxy+training+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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://queure.ru/pbw?utm_term=bluecoat+proxy+training+pdf PDF link annotation
    • https://revotilam.weebly.com/uploads/1/3/4/7/134732497/8dfb42.pdfIn PDF document text
    • https://wanesoxe.weebly.com/uploads/1/3/4/3/134369563/9414121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5ffab5e077dfc.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/5386787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_60201c928d4d5.pdfIn PDF document text
    • https://jevupatumatawi.weebly.com/uploads/1/3/4/3/134377955/8420855.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/binezoxopabuwani.pdfIn PDF document text
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/turasajose-luluxuzeti.pdfIn PDF document text
    • https://fuxamuwilemodo.weebly.com/uploads/1/3/4/4/134478429/3018678.pdfIn PDF document text
    • https://zoladikadaxupaj.weebly.com/uploads/1/3/4/6/134635808/falivozupofu.pdfIn PDF document text
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/tijesededilezogikivi.pdfIn PDF document text
    • https://mululugasafes.weebly.com/uploads/1/3/1/6/131636627/3552742.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/cd274.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/58f86668-e4da-4fe4-b435-a6ae72d53269/ranger_rci-2950cd_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae4a96-01c9-4d52-a2be-059c635f3a08/mesures_de_longueurs_cm2_leon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3f0282-cb57-4e2b-b857-8ed1c3578580/hoover_s3639_windtunnel_canister_vacuum_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c76dfad-e5e0-41ae-8141-8ae2c1b6c48f/how_long_will_misa_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba9d316-b749-422e-a209-177510a2b942/suzerarur.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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 5364 bytes
SHA-256: 956df06c9ad99e2b3807f02cb1a6a413af0685bb1593d55ab106192adf880bdb
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 10608 bytes
SHA-256: f7b4f4046a73049005b66be9280735fd1881b4854b3c3d1dfc1c1fb88d1cd73e