Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bc78c60fd0cc6f…

MALICIOUS

PDF

77.3 KB Created: 2021-06-09 15:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 090511b90223a01e3ed4348c20d6bcd2 SHA-1: aa7ba2588ab2ca34170ac7b29c8b65bea033fe00 SHA-256: 63bc78c60fd0cc6f9b3410e7402fb53959a91a1fcb9d0eed14c3f3e37882d129
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services like Weebly and pbworks, suggesting a link farm or SEO manipulation tactic. The primary URL, https://krisoc.ru/pbw?utm_term=julie+and+the+wolves+pdf, is likely part of this scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://krisoc.ru/pbw?utm_term=julie+and+the+wolves+pdf PDF link annotation
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/dca73137.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/f1b5e.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/08899c5f0bc4.pdfIn PDF document text
    • https://sagokawosulo.weebly.com/uploads/1/3/4/9/134904643/rilukemogika.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/5869594.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/4334586.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/084782a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_6014ca356a966.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/ac7f2ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_60095213a4008.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454161/normal_60b7097d39e0f.pdfIn PDF document text
    • https://bedeliwukaror.weebly.com/uploads/1/3/4/5/134512578/nubimepolomuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5fdfc2839446c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudejob.pbworks.com/f/77548351235.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/w/file/fetch/144921999/56865859966.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144929301/73352872527.pdfIn PDF document text
    • http://momukaduwe.pbworks.com/w/file/fetch/144885114/42748790512.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/what_does_midnight_mean_spiritually.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144666639/jatejusojaxab.pdfIn PDF document text
    • http://zukitisa.pbworks.com/w/file/fetch/144773655/vas_score_range.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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5172 bytes
SHA-256: 4d860afa5126fae2668c2778a1eeb8a5d2c40a76eb93c56de19a2d8348ad37cc
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10844 bytes
SHA-256: c065b374bad83f7aef528b741ca7965340762c7f6da826f21b24262ae4b858b1

Open this report in the interactive analyzer, or submit your own file for analysis.