Malicious PDF — malware analysis report

Static analysis result for SHA-256 769152eecc7e9453…

MALICIOUS

PDF

37.0 KB Created: 2020-06-20 19:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 17ea9e0b2d78eb9295f6248172e68217 SHA-1: 997ad33b5317e5ef398afb80804ff3647c20e656 SHA-256: 769152eecc7e9453ba55362eb6d9e7a51c532eec94376d395aa070d1ca22f1df
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body presents a plausible lure, "Simpson dryer repair manual", to encourage users to click these links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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 http://reinventing.es/uploads/1/3/1/8/131856316/131856316.html#simpson+dryer+repair+manual PDF link annotation
    • http://3m2.undesirable.us/uploads/1/3/0/5/130588584/1278548.pdfIn PDF document text
    • http://braineducationconference.com/uploads/1/3/0/2/130291592/9193891.pdfIn PDF document text
    • http://hostmaster.ggbarry.com/uploads/1/3/1/4/131453033/ruwep.pdfIn PDF document text
    • http://fsuseniorhealth.org/uploads/1/3/0/5/130550777/jirixifazonoto-rosagop-putotomo-vavaruvebul.pdfIn PDF document text
    • http://productsbeast.com/uploads/1/3/1/8/131856173/puzifexeti_vimotulebu_wevabutuwufaxos_lapam.pdfIn PDF document text
    • http://mail.billigbuchhaltung.ch/uploads/1/3/0/5/130541103/widosavagapinekor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52C3 5112 bytes
SHA-256: 3dc32f26f7c855c5ec031edbc1560f751adbc5176e98332b172991c1f685f4ba
font_01_sfnt_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 10604 bytes
SHA-256: fc0e22b5b409407e7f82376f52f797c7b8fb50e7f615d56e7ad4ee1488278f30

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