Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b55fafce2a1078…

MALICIOUS

PDF

38.1 KB Created: 2020-04-02 11:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9544e890ccbfcb81ef1f99bcf3acbad0 SHA-1: 558e16a2dc0348ce0bb07827bad58f0879d3529e SHA-256: 77b55fafce2a10785f50d4ebb45b15eba66d145f52af6daf5827a43dbdc02756
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the mass distribution of external links, likely to manipulate search engine results or serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://sound-soul.com/uploads/1/3/0/6/130604133/130604133.html#stewart+calculus+early+transcendentals+6th+edition+solutions
    • http://harvestlakespharmacy.com/uploads/1/3/0/6/130603814/xotejoxodakujo-lowab-vurepuzikogofit-sasegozo.pdf
    • http://powerfullrecharge.net/uploads/1/3/0/8/130874241/xorajapafuwep.pdf
    • http://rootedremediherbals.com/uploads/1/3/0/6/130604393/3933014.pdf
    • http://mx.jricheynash.com/uploads/1/3/0/5/130539179/wubisuxugemoxir-gifusag-wumobobejunurik-kijetejo.pdf
    • http://lauren-teaches.com/uploads/1/3/0/5/130550914/ruluvukezovafumunala.pdf
    • http://stealth9.com/uploads/1/3/1/4/131437875/kabozugopulabu_gatibupironog_sigijejo.pdf
    • http://dangerzoneuboldo.com/uploads/1/3/1/0/131070754/13d31f318de0f.pdf
    • http://crystalcrones.com/uploads/1/3/0/5/130539442/zidexuvov-zuminisara-nubewaje.pdf
    • http://spurhq.com/uploads/1/3/0/4/130483577/9564f94fa1d7.pdf
    • http://work4utopialtd.com/uploads/1/3/0/5/130551402/337484.pdf
    • http://amurphyjourney.com/uploads/1/3/0/5/130588688/pagutinopuf.pdf
    • http://legendthelabel.com/uploads/1/3/0/9/130969905/xifawubotoje.pdf
    • http://carterandsons.net/uploads/1/3/0/4/130476214/risarenuzibaninamam.pdf
    • http://bubblesandbarscompany.com/uploads/1/3/0/8/130813483/470b999798d93.pdf
    • http://www.brewedbyagirl.com/uploads/1/3/1/1/131164168/watokapikawa.pdf
    • http://mbe2018abstractsubmssion.com/uploads/1/3/1/3/131378780/xizujumekifatiku.pdf
    • http://lumibodyart.com/uploads/1/3/0/4/130483973/f67463c156869f.pdf
    • http://www.wisdomofjim.com/uploads/1/3/0/6/130639628/xofusipevimusuzefo.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_off00006b2f.bin
c4cc6092a7632dbff59c0c17a3a3f5e0c9f28201af9f569b5c175a9549426bef
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 8140 bytes