Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dfcd948b7f36ec…

MALICIOUS

PDF

44.9 KB Created: 2020-06-07 10:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 7ecd5de8f17134cd1e9566e7d6d7850b SHA-1: a3f7fe5c78741bb4a0324ff54e324dbb07f90d93 SHA-256: 86dfcd948b7f36ecc7b3ee915b264fd8dccf81f4bd13e648672f052c8beec662
136 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the PDF structure itself is used to host and link to potentially harmful content.

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://buttemtnews.com/uploads/1/3/0/7/130775275/130775275.html#high+stakes+kotor+2 PDF link annotation
    • http://loughrynnselfcateringaccommodationmohill.com/uploads/1/3/0/5/130589217/xivuvosilikewawa.pdfIn PDF document text
    • http://legalpt.com/uploads/1/3/1/4/131406480/b3e7e2a4b.pdfIn PDF document text
    • http://mta-sts.mail.innovomedical.com/uploads/1/3/0/7/130776795/800288.pdfIn PDF document text
    • http://socksthatspeak.com/uploads/1/3/0/4/130488199/pukoximax.pdfIn PDF document text
    • http://cpanel.artlabriola.com/uploads/1/3/0/7/130738537/b70bcbc3b99879.pdfIn PDF document text
    • http://mobilecontentz.org/uploads/1/3/1/3/131383204/47b6b87a.pdfIn PDF document text
    • http://rowdybartending.com/uploads/1/3/0/9/130969459/d372d7.pdfIn PDF document text
    • http://bruce-lee-roy.com/uploads/1/3/0/7/130775169/4179278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wuzuduf.files.wordpress.com/2020/06/17578031837.pdfIn PDF document text
    • https://tavatolu.files.wordpress.com/2020/06/liwaduru.pdfIn PDF document text
    • https://denorawe.files.wordpress.com/2020/06/vamuvosevakogal.pdfIn PDF document text
    • https://duwadunox.files.wordpress.com/2020/06/15345897747.pdfIn PDF document text
    • https://bokisutedex.files.wordpress.com/2020/06/kuwodolonoxajizizeza.pdfIn PDF document text
    • https://ravejewawuwo.files.wordpress.com/2020/06/kovalumonedafib.pdfIn PDF document text
    • https://wojimuretake.files.wordpress.com/2020/06/demegofenazope.pdfIn PDF document text
    • https://tupawev.files.wordpress.com/2020/06/37234407862.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B3 11244 bytes
SHA-256: e921c9b0fd9842a37cdb043bce4631cfbfd69f5d9e0ba271812377eb64d7ad7d

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