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)
MD5: 17ea9e0b2d78eb9295f6248172e68217 SHA-1: 997ad33b5317e5ef398afb80804ff3647c20e656 SHA-256: 769152eecc7e9453ba55362eb6d9e7a51c532eec94376d395aa070d1ca22f1df
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to a "Simpson dryer repair manual" and embeds a large number of external links. The PDF_SEO_LINK_FARM heuristic indicates a link farm, and the ML_NYX_PDF_MALICIOUS model strongly flags the document as malicious. The embedded URLs are likely used to redirect users to malicious sites or to distribute further malware.

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
    • http://3m2.undesirable.us/uploads/1/3/0/5/130588584/1278548.pdf
    • http://braineducationconference.com/uploads/1/3/0/2/130291592/9193891.pdf
    • http://hostmaster.ggbarry.com/uploads/1/3/1/4/131453033/ruwep.pdf
    • http://fsuseniorhealth.org/uploads/1/3/0/5/130550777/jirixifazonoto-rosagop-putotomo-vavaruvebul.pdf
    • http://productsbeast.com/uploads/1/3/1/8/131856173/puzifexeti_vimotulebu_wevabutuwufaxos_lapam.pdf
    • http://mail.billigbuchhaltung.ch/uploads/1/3/0/5/130541103/widosavagapinekor.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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