Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2e649645f820a1…

MALICIOUS

PDF

78.2 KB Created: 2020-11-13 07:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2216836f9634d792673044cbdd87d9 SHA-1: 90a6a487caf568d1c92e99810da6abd211c98b23 SHA-256: fe2e649645f820a11434918d131cea6aac2fa5be72077651d0bc4aab82da98ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=dictionary+of+symbols+pdf+free+download
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/juralaxasoriga_zopaboku.pdf
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5fa6e3a12978a.pdf
    • https://cdn-cms.f-static.net/uploads/4394068/normal_5f90f58f5023d.pdf
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5fa1f17c36fbd.pdf
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f8d17c516983.pdf
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/8563370.pdf
    • https://gasagadivegolix.weebly.com/uploads/1/3/4/4/134488570/982406b6e.pdf
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/gekinafataluji.pdf
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/7189586.pdf
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f9a38d2e9e4a.pdf
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fa90f4a89e7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kubafezin/warrior_cats_books_in_order_of_release.pdf
    • https://s3.amazonaws.com/susopuzupure/88258452061.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e718.bin
e97021f80bc68ca8a890bda6c3afc9adcf5602726c2ec6b836584d46c8d3db3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5424 bytes
font_01_sfnt_off0000f97b.bin
3d1dcc536acddceac2f701faf6c8420fa045a1b8f46244fd19a550ee129e6b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10736 bytes
font_02_sfnt_off00011df2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 4324 bytes