Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c3700fbc1e0ee…

MALICIOUS

PDF

39.4 KB Created: 2020-03-29 12:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 071cbe8d07de9003605e4bca9c2aad2e SHA-1: d30b93a2e3e610d6c935d10d25428c98597ad0cc SHA-256: 5f7c3700fbc1e0eeb22b6b7926d0f92a45f04b619be6c3ac6702fe20829b6e07
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, while partially garbled, contains references to concrete dosage and the wkhtmltopdf tool, suggesting a deceptive pretext for the link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://neokundalini.org/uploads/1/3/0/8/130874641/130874641.html#dosificacion+de+concreto+175+con+hormigon
    • http://peoria31.com/uploads/1/3/0/6/130604548/wagovupobate_fijulojonesofuv_pirus.pdf
    • http://utahslowpitchweeklynow.com/uploads/1/3/0/9/130969548/2885936.pdf
    • http://solidfactories.com/uploads/1/3/0/5/130544147/zugazusamadaxezekum.pdf
    • http://yamt.org/uploads/1/3/0/9/130969265/zerevitometezilotid.pdf
    • http://jiujitshappens.com/uploads/1/3/0/3/130323552/worubexoxotidanef.pdf
    • http://mailstreamdirect.com/uploads/1/3/0/8/130813786/6a3426f56c5bbdd.pdf
    • http://lgbtpsychotherapy.net/uploads/1/3/1/3/131381991/920ad.pdf
    • http://ordervelocity.com/uploads/1/3/0/4/130483817/68a083aa8f.pdf
    • http://graceandcompanysalonandboutique.com/uploads/1/3/1/3/131379738/sazozulefo.pdf
    • http://jdcarter-vizcom.com/uploads/1/3/0/6/130604984/3659327.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_off00006d71.bin
c1762186120857faea25b8cd8380233ad59a59009ddfaf6077fa777d08afa18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D71 9408 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.