Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4114fc8711421d…

MALICIOUS

PDF

34.0 KB Created: 2020-05-16 23:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089b31a0beca2fd78d3894d4a1d8dfa4 SHA-1: d12f74ef977cd666ffb008c453c54e3f650f1f9a SHA-256: 7c4114fc8711421d067e729ed943a0184786b51e799a60025951381ddd6e0bc0
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs, indicative of an SEO poisoning or link farm attack. The ML classifier strongly flagged this sample as malicious. The embedded document body text, while partially corrupted, contains references to a user guide and application details, likely serving as a lure to disguise the malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://switalia.com/uploads/1/3/0/6/130639459/130639459.html#nanometrics+centaur+user+guide
    • http://businessstreams.com/uploads/1/3/1/3/131398025/2183147.pdf
    • http://aliciamariesaddoris.com/uploads/1/3/1/4/131452825/kopexeveloxegefi.pdf
    • http://powerandsteam.com/uploads/1/3/0/2/130271102/20b9edbf96502.pdf
    • http://fgmacessoriosmedicos.com/uploads/1/3/1/0/131070196/3972647.pdf
    • http://timberlinemedicalconsulting.com/uploads/1/3/0/6/130640141/simopoj_modivamasovuna_nokepot_doteritelepeva.pdf
    • http://artisan-trails.com/uploads/1/3/0/3/130313044/19f6f.pdf
    • http://mccallumjones.com/uploads/1/3/0/6/130622002/tenok.pdf
    • http://thekyur.com/uploads/1/3/0/7/130775746/66dbfd8c8be55.pdf
    • http://dogoodnyc.com/uploads/1/3/0/6/130604505/samatagepuwada_salerofetibigef_falep.pdf
    • http://clubcooeesupport.com/uploads/1/3/1/6/131607305/tesivubuf-xovatexixovaro-lotozodivared.pdf
    • http://hacklerfineart.com/uploads/1/3/0/7/130775047/balaxoxivek-vaboxedodireri-vorafonejup.pdf
    • http://tonysconstructioninc.com/uploads/1/3/0/6/130639036/7ba17f706d7.pdf
    • http://adelaidespecialistcoordinators.com/uploads/1/3/0/2/130289503/bowox-xarusesov.pdf
    • http://canyondesigninc.com/uploads/1/3/0/6/130639533/600c7f9d55ecfc.pdf
    • http://babydollcarek.com/uploads/1/3/0/7/130738837/105659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b58.bin
a0c1801ed09779a6ff4e2ac94a9f34e7665becb4d5eb274994369f3f8d66050d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B58 9704 bytes

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