Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e7752ab8ef12d9…

MALICIOUS

PDF

27.6 KB Created: 2020-05-24 01:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39dfdbd990f63fcb59faefb1013b4dcf SHA-1: 598f2f6c5fd0c6ba8dd0280fddb80d871d8d6091 SHA-256: 42e7752ab8ef12d929103ce4063ba73f78f40fe06ced012e5144c5188978733d
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of numerous suspicious URLs and the document's structure point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 27 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://x0463543xstreamtravel.xsideas.com/uploads/1/3/0/5/130543190/130543190.html#ejercicios+resueltos+de+intercambiadores+de+calor+de+tubo+y+coraza
    • http://integratescore.org/uploads/1/3/0/9/130969061/lavegaredagoginepefo.pdf
    • http://caccdevelopments.com/uploads/1/3/0/2/130272577/tawosopopixum_xiduwajifur.pdf
    • http://wvepfc.com/uploads/1/3/1/3/131381066/9123849.pdf
    • http://lynnvogel.com/uploads/1/3/0/7/130775979/9359086.pdf
    • http://pdsfortdlus.com/uploads/1/3/0/4/130483656/ad928f439aa0d.pdf
    • http://die-praxiskultur.com/uploads/1/3/0/7/130738527/2887460.pdf
    • http://thespeckledhen.shop/uploads/1/3/1/4/131483009/zoxexukinirada.pdf
    • http://mrfleischer.com/uploads/1/3/0/3/130323817/5be8c03f3503839.pdf
    • http://ns6.handmadebybek.com/uploads/1/3/1/4/131453843/7530458.pdf
    • http://senyonga.com/uploads/1/3/1/1/131163733/743e0e4e5.pdf
    • http://2306lakeviewdr.com/uploads/1/3/0/7/130775819/kezed.pdf
    • http://sunshadeswindowblinds.com/uploads/1/3/0/6/130603978/48be5d.pdf
    • http://mail.anthelionjewelry.com/uploads/1/3/1/3/131398573/9256379.pdf
    • http://thebabercollection.com/uploads/1/3/0/8/130814161/e4e3ccb.pdf
    • http://bigfishvinylrecords.com/uploads/1/3/0/7/130776589/nekasikomufanamemolo.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_off00004732.bin
57879a70bd58ed5bb7ab7f7a5101b8e17d36c150b073673ff8b3ba865665ec68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4732 7928 bytes

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