Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c91cc1f79b9e057…

MALICIOUS

PDF

43.2 KB Created: 2020-03-27 11:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee668952c2392b8f2d11e331e716c77c SHA-1: 69e20b7d8481287b3ab6b16aa16e71d238da63d5 SHA-256: 7c91cc1f79b9e057467f8285ff6dbe091afbc6f97bd355ed837a501ab72c952d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, likely intended to manipulate search engine results or distribute further malicious payloads through the linked PDFs. No scripts were extracted from this sample.

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://welcomehouserental.com/uploads/1/3/0/9/130969265/130969265.html#oraciones+con+nucleo+sujeto+y+predicado+ejemplos
    • http://bodhimassagedarwin.com/uploads/1/3/0/5/130545884/nafajeziniferuvux.pdf
    • http://midhudsoncpr.com/uploads/1/3/0/7/130738680/9330316.pdf
    • http://sthfromnth.com/uploads/1/3/0/4/130483134/wufeno.pdf
    • http://jeremiahgray.net/uploads/1/3/0/7/130740242/5845019.pdf
    • http://home.3dk.co.uk/uploads/1/3/0/5/130589431/e6f6c62f.pdf
    • http://lolling.design/uploads/1/3/0/6/130621785/takuxubufisa.pdf
    • http://jeffholland.org/uploads/1/3/0/3/130323437/6359607.pdf
    • http://takishikawadesign.com/uploads/1/3/0/7/130739835/1262939.pdf
    • http://artbeyond500.com/uploads/1/3/0/9/130969448/7018653.pdf
    • http://www.clevelandchamberchoir.com/uploads/1/3/0/6/130622104/tivumubovoge_difojirazaxovem_wubosujum.pdf
    • http://ofedotova.com/uploads/1/3/1/3/131382673/2b68f5757.pdf
    • http://thestockmarketrecap.net/uploads/1/3/0/6/130604892/45459d.pdf
    • http://www.sd50dfl.net/uploads/1/3/0/5/130590139/temuro.pdf
    • http://bridgepointsearch.com/uploads/1/3/0/6/130621591/4242643.pdf
    • http://www.tashellemandic.com/uploads/1/3/0/5/130551299/rovudaz.pdf
    • http://slim-treats.com/uploads/1/3/1/0/131071252/buwesagubeduwesukow.pdf
    • http://you-x-wallet.club/uploads/1/3/0/8/130873992/lileruxe.pdf
    • http://bostonchaptermerch.com/uploads/1/3/0/5/130544968/5859728.pdf
    • http://pierrecyr.ca/uploads/1/3/0/5/130589195/gurepisoloderuk.pdf
    • http://www.hiltonlifting.com/uploads/1/3/0/2/130270994/wegawepap_gixur_mamewidoredibog_vinojadat.pdf
    • http://www.cafedesaobento.com/uploads/1/3/0/4/130488446/janemekot.pdf
    • http://mta-sts.lindagrahamdesign.com/uploads/1/3/0/5/130547373/dofon.pdf
    • http://upstreaminnovations.net/uploads/1/3/0/7/130740209/8552366.pdf
    • http://hostmaster.batsonhouse-salcombe.com/uploads/1/3/0/6/130605389/peduzulapafuvaj-bokis-bijotijomol-ximesebaw.pdf
    • http://hostmaster.batsonhouse-salcombe.com/uploads/1/3/0/6/130605389/peduzulap
    • 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_off00007d37.bin
633c299fa42e29d440f05d02e1121241d0967150c54a2fb079f6acfde4d3b02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D37 8720 bytes

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