Malicious PDF — malware analysis report

Static analysis result for SHA-256 83140df26fa5eb82…

MALICIOUS

PDF

38.6 KB Created: 2020-03-20 07:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: cd5f42fdab7f780dee272782ec57fca6 SHA-1: f9d2c594b071d5a0d4f3c71c2d2b4dd561ee82e4 SHA-256: 83140df26fa5eb82985e8512939e88f0fe5277f0f2003bbf70b58c76ec25713e
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 hosted on various domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass link farm. The embedded URLs are likely used to distribute malware or engage in SEO spam, and the document itself appears to be a lure. 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://completeimage.net/uploads/1/3/0/5/130589295/130589295.html#tipos+de+la+administracion+publica PDF link annotation
    • http://hypebaysg.com/uploads/1/3/0/5/130589219/31a5f7292e5f.pdfIn PDF document text
    • http://www.progressivepsychologicalservices.com/uploads/1/3/0/3/130379504/fudokofulorod_rivut.pdfIn PDF document text
    • http://www.salonbusinessowners.com/uploads/1/3/0/5/130539251/3680608.pdfIn PDF document text
    • http://apexpeoguide.com/uploads/1/3/1/0/131069819/buserebefijedabe.pdfIn PDF document text
    • http://hollandghanaplatform.net/uploads/1/3/0/6/130604040/porigit.pdfIn PDF document text
    • http://barnwoodbilliards.com/uploads/1/3/0/7/130740128/1a16adabba.pdfIn PDF document text
    • http://dia-taylor.com/uploads/1/3/0/3/130323329/6652348.pdfIn PDF document text
    • http://njgraniteconstruction.com/uploads/1/3/0/2/130289310/nuvabotesuxaf.pdfIn PDF document text
    • http://ateenagescrewup.net/uploads/1/3/0/6/130604368/lajiwapolijirofenel.pdfIn PDF document text
    • http://mail.eversouthbakes.com/uploads/1/3/0/3/130323631/5529389.pdfIn PDF document text
    • http://ifocused.org/uploads/1/3/0/7/130775144/gulanemujaduxib-zotivagabo-gixipopozimibum-sumepimurosular.pdfIn PDF document text
    • http://74-123-72-210.mgwnet.com/uploads/1/3/0/6/130640039/7044213.pdfIn PDF document text
    • http://debbybolandwatt.net/uploads/1/3/0/7/130738984/momafener-pozetakil-niditanoj.pdfIn PDF document text
    • http://www.c3industriesllc.com/uploads/1/3/0/2/130272070/xugidutuxomok_javuvuzaselaxox_jesuxagiwosiz.pdfIn PDF document text
    • http://mta-sts.mail.hoernli-hemberg.ch/uploads/1/3/0/5/130545249/952c895e44d7b.pdfIn PDF document text
    • http://www.astrologicalinsightsonline.com/uploads/1/3/0/5/130588173/berugupimo-wijazamef.pdfIn PDF document text
    • http://reveriecoffeeco.com/uploads/1/3/0/4/130488157/dugojafufibadow_damanafibotulo_jifanosepusozur_nexaj.pdfIn PDF document text
    • http://aandeapothecary.com/uploads/1/3/0/6/130620874/xepazuvegoludiruv.pdfIn PDF document text
    • http://newconstructionchicago.com/uploads/1/3/0/7/130739087/1979007.pdfIn PDF document text
    • http://lotkgyl.sites.looka.com/uploads/1/3/0/2/130270826/juwubanogunusolonun.pdfIn 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
🗂 Part of campaign: boshuster.com 3 samples

Related samples 1

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Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC6 7412 bytes
SHA-256: 34ec9280ab1b315c2eaa60a54d75441b9f25e9a41c25a742e1285a9a7e4fef5b

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