Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2cf8cd42feb49b…

MALICIOUS

PDF

71.8 KB Created: 2021-01-16 11:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b93326fd2ffda27b32f8acf7bbea93d4 SHA-1: bdcbe11f0d1187b4539c0cff12497f8325afd5df SHA-256: be2cf8cd42feb49b2f255eb3d27345c8e736a85034355feb59848040527f0c42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV 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 used for phishing or malware distribution. The embedded URLs and the heuristic findings strongly suggest this document is part of a phishing campaign, likely using a lure related to study guides.

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://trafffi.ru/123?utm_term=ap+french+study+guide+2020 PDF link annotation
    • https://gidibaxatum.weebly.com/uploads/1/3/4/8/134889182/mivupolu.pdfIn PDF document text
    • https://zaroxirag.weebly.com/uploads/1/3/4/4/134457582/savopediwujiz.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/daxegukodewaroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fb330c220c80.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/1283816.pdfIn PDF document text
    • https://site-1177243.mozfiles.com/files/1177243/33494014610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5f9284e2d3607.pdfIn PDF document text
    • https://site-1247186.mozfiles.com/files/1247186/apache_maven_for_linux.pdfIn PDF document text
    • https://kazefapakoj.weebly.com/uploads/1/3/4/6/134644741/paginap-kobifij-sivakufijonat.pdfIn PDF document text
    • https://bugasezafefadi.weebly.com/uploads/1/3/1/6/131637254/9785279.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/kerofaredujajat.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/6361082.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/4175211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sevoga/65523329748.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/5961310392.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/ctet_july_2019_answer_key.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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 5540 bytes
SHA-256: e793e93e496f6fcd73609db5ebd9a6b37f0b0d46c31cfdc6c3e260b0df95c21d
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 10668 bytes
SHA-256: 0330f88ee8273a63f3c1b6c0d212bb444380bffd72ec121e1b85d0539eb8be52

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