Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b1bd8cdbd71b6a…

MALICIOUS

PDF

41.7 KB Created: 2020-03-26 04:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9fe11e2129c8aba617aee47ddfc34d22 SHA-1: 298a6ef0d1e3fdebf56ee3a5f14a0bf12d9fe312 SHA-256: 81b1bd8cdbd71b6a9f6c6e9f0df5085e3bce09d3fa6d43896495f32b3705a93a
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content or SEO spam. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous generated URLs supports this assessment. No scripts were extracted, but the document's structure and embedded links suggest it's designed to redirect users 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://sanfranciscopeacetreaty.org/uploads/1/3/0/5/130538941/130538941.html#presto+pressure+canner+manual+01781
    • http://nuezdejabon.site/uploads/1/3/0/3/130379625/mibumafowolo_danesopuvemu_xiborevilo.pdf
    • http://coaching-pearlmoments.net/uploads/1/3/0/9/130969592/4abcbb7f53d7.pdf
    • http://xcelerationfitness.online/uploads/1/3/0/8/130874084/1c58a4.pdf
    • http://localhost.christking.org/uploads/1/3/0/9/130969628/ff04d4c9024703.pdf
    • http://qiessence.net/uploads/1/3/0/4/130476342/wilimisu.pdf
    • http://whiteoakplantationbr.com/uploads/1/3/0/6/130639962/ragirezajexobat-bigoragivadewuk-dosojami.pdf
    • http://detox2020retreat.com/uploads/1/3/0/7/130738548/3bb63f.pdf
    • http://healergy.org/uploads/1/3/0/7/130740412/0be78369.pdf
    • http://nwlaautomationgroup.com/uploads/1/3/0/7/130776268/6785951.pdf
    • http://finegerman.com/uploads/1/3/0/7/130775778/ecaffa6178.pdf
    • http://www.ennellgroup.com/uploads/1/3/0/9/130968960/5207146.pdf
    • http://ip123-colo.mnemonix.com/uploads/1/3/0/7/130776328/cfaa90cf.pdf
    • http://ent7082a.online/uploads/1/3/0/6/130604136/wumemegididavibuf.pdf
    • http://orderofthedarkcrown.com/uploads/1/3/0/7/130739158/15141.pdf
    • http://purensimpleohio.com/uploads/1/3/0/6/130620868/021195981.pdf
    • http://keithgaryproductions.com/uploads/1/3/0/7/130775135/xiluve.pdf
    • http://kinobykimie.com/uploads/1/3/0/3/130379101/dca79.pdf
    • http://completecarechiropractictables.com/uploads/1/3/0/6/130639546/laxuvosobal.pdf
    • http://beebyharvesting.net/uploads/1/3/0/5/130543020/lokuba-lelam-lijumekarogom.pdf
    • http://www.solmobilemassage.com/uploads/1/3/0/5/130545199/5903393.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_off00007969.bin
da561d0a51a0396e7d65f455fb7be2f47a27157ff18a00bcab17692b78f17ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7969 8300 bytes

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