Malicious PDF — malware analysis report

Static analysis result for SHA-256 841cd81ba7155cf1…

MALICIOUS

PDF

33.9 KB Created: 2020-05-25 16:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ba8e104739604635d790b4a1563dc8b SHA-1: e396618f302604d89fb4c09376dc2e8ada9d53ef SHA-256: 841cd81ba7155cf1a5987db8f4fe6b41eadc1005662f61195940c732be3b0527
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to numerous unrelated websites. No scripts were extracted, but the sheer volume of links points to a malicious intent to drive traffic or host further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://3t2.undesirable.us/uploads/1/3/0/6/130639444/130639444.html#harley+davidson+collectibles+price+guide
    • http://theestheticsstudioonline.com/uploads/1/3/0/5/130544090/gobazarejisu-fabodegibeve-xirefisa.pdf
    • http://morenala.org/uploads/1/3/1/6/131606349/9630142.pdf
    • http://crazyredbeard.com/uploads/1/3/0/9/130969922/4379405.pdf
    • http://webdisk.poodlesoftampabay.com/uploads/1/3/0/9/130969542/4b0d036a7bd2.pdf
    • http://social5-0.com/uploads/1/3/1/4/131409926/gamamuwala-xofavepumipavi.pdf
    • http://weloveliteracy.org/uploads/1/3/0/6/130604054/05d6798f61b3286.pdf
    • http://tanveerzamani.com/uploads/1/3/1/3/131379914/didowegosimabi_damuji.pdf
    • http://evbossguide.com/uploads/1/3/0/6/130639849/beed1f05c9e6.pdf
    • http://linevideochat.com/uploads/1/3/1/4/131452923/1722309.pdf
    • http://jlctechnologies.com/uploads/1/3/1/4/131410090/adc056200f.pdf
    • http://my-atv-store.com/uploads/1/3/0/3/130379357/pakugupu-sakimixevuxer-zumopiwebagafud-gotoru.pdf
    • http://effiesgaming.com/uploads/1/3/0/5/130551067/xibesegub_kamuwugegab.pdf
    • http://scottfreefishingcharters.com/uploads/1/3/0/2/130272648/4927531.pdf
    • http://octantnavigates.com/uploads/1/3/0/5/130551287/8611764.pdf
    • http://sazanpd.com/uploads/1/3/1/4/131438024/tegigevijami.pdf
    • http://cyclecoachingcalifornia.us/uploads/1/3/0/2/130289339/3461633.pdf
    • http://shrinkysheets.com/uploads/1/3/0/6/130639687/4540785.pdf
    • http://cwdesigns.nl/uploads/1/3/0/4/130483210/rusesisirewew-korizinurebo-kuzezuwisabek-kofapawapobaza.pdf
    • http://impactcustoms.com/uploads/1/3/1/4/131438093/bozora_xosopad.pdf
    • http://cecmllc.com/uploads/1/3/0/9/130969824/8381845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005631.bin
740f6e8e20b7d37af92a45e84a6685a16068c15c6368a926c32c902b0ae51332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5631 11372 bytes

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