Malicious PDF — malware analysis report

Static analysis result for SHA-256 58814eb91d63f91c…

MALICIOUS

PDF

32.6 KB Created: 2020-05-23 09:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c919cd5b2c8c3e2219c6c85b93fb534 SHA-1: ea8e8b107c2625049624d915593a5a2468403fce SHA-256: 58814eb91d63f91c43ad82c39d2a8650cfa3d62ca9d020b425a07b7af770067d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to a book title and the wkhtmltopdf generator, suggesting a lure. The primary attack pattern involves directing users to a multitude of external PDF files hosted on various domains, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://heath-family.rominastiebenphotography.com/uploads/1/3/1/3/131381151/131381151.html#meggs%2527+history+of+graphic+design+6th+edition
    • http://michelleandrews.org/uploads/1/3/0/2/130274338/musepegirisirisapet.pdf
    • http://smartlookpalakollu.com/uploads/1/3/0/7/130775125/8503963.pdf
    • http://reclaimchristmas.com/uploads/1/3/0/6/130604988/mofexukugenutoj-kevoguje-mepenu.pdf
    • http://deadbadgersclub.com/uploads/1/3/1/6/131607363/6149d49d7537.pdf
    • http://powergeardrums.com/uploads/1/3/0/2/130271002/739382.pdf
    • http://jussiesmollettonline.com/uploads/1/3/0/6/130605267/sadefeguxuduribe.pdf
    • http://krjblueline.net/uploads/1/3/0/5/130589194/zukinasuwewa_siwekuba.pdf
    • http://wastesolutionsystems.com/uploads/1/3/0/5/130551390/govisovi.pdf
    • http://touteslespromesses.com/uploads/1/3/0/8/130874377/sunemivaxumukuw_xekopesoripawob_gikezewolavate_nomak.pdf
    • http://metroeastpastors.org/uploads/1/3/0/5/130589128/bilagibapak_kakewibom.pdf
    • http://asadevelopment.net/uploads/1/3/0/5/130588966/nubage.pdf
    • http://cfinedesign.com/uploads/1/3/0/4/130476791/xidejunurixawen.pdf
    • http://barbarajtorreyart.com/uploads/1/3/0/5/130590656/puzegapidomonisogosa.pdf
    • http://sarahsoap.com/uploads/1/3/0/6/130639140/4097383.pdf
    • http://filedpolished.com/uploads/1/3/0/7/130740344/zurululigopora_gijozafeb_garered_xadug.pdf
    • http://onourwaytravel.com/uploads/1/3/0/7/130776249/796cdeb8.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056b9.bin
53dd26b006bb665ab3ee3f533d4f928056802ab648c99d7ec5b4e839172589ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B9 9392 bytes