Malicious PDF — malware analysis report

Static analysis result for SHA-256 537653b596ed0766…

MALICIOUS

PDF

33.4 KB Created: 2020-03-30 12:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38c38bb58a4f9647eecd5c020c575a32 SHA-1: dfc83a72fc4812744e2558179e66beab1470a70c SHA-256: 537653b596ed076662d324b738eaf3f67b8bef4db727c5d642beb184123d517c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO poisoning attack, where the document is designed to drive traffic to a network of malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a malicious campaign. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://74-123-75-199.mgwnet.com/uploads/1/3/0/6/130640023/130640023.html#atlas+del+mundo+actualizado+pdf
    • http://bedbeacon.net/uploads/1/3/0/6/130639566/f8101b59e004.pdf
    • http://n33atthebeltline.com/uploads/1/3/1/4/131407284/8df01.pdf
    • http://maplewood-music.com/uploads/1/3/0/7/130776343/xagiwafibomi_favabarub_jejajakuvotuwe.pdf
    • http://firstlutheranwp.org/uploads/1/3/0/6/130639259/8b935fb.pdf
    • http://chestnutdesign.org/uploads/1/3/0/4/130435807/totexopa.pdf
    • http://delilahmusicchicago.com/uploads/1/3/0/9/130968957/famejafebubuta-bisof-zepozitoxa-wotunib.pdf
    • http://bgfireprotection.com/uploads/1/3/0/5/130539457/2106770.pdf
    • http://decommissioninggom.offsnetevents.com/uploads/1/3/0/2/130287813/3300031.pdf
    • http://erikaarana.net/uploads/1/3/1/0/131070920/90a3f2398.pdf
    • http://shayensley.com/uploads/1/3/0/6/130603997/524437.pdf
    • http://pratermarketingandmedia.com/uploads/1/3/0/4/130483842/4162920.pdf
    • http://4trisdesigns.com/uploads/1/3/0/7/130776007/5317599.pdf
    • http://goldenisissouldance.com/uploads/1/3/0/3/130323229/883980.pdf
    • http://mytherapybox.com/uploads/1/3/1/0/131070170/jolodaxes.pdf
    • http://clumsybutcute.com/uploads/1/3/0/6/130620207/nakeruditakipu.pdf
    • http://touringteachers.org/uploads/1/3/0/6/130604264/3010599.pdf
    • http://markscarb.com/uploads/1/3/0/8/130873976/vakofesaga_jujuvadufisixid.pdf
    • http://lookinsidenyc.com/uploads/1/3/0/7/130739322/a8d7b2.pdf
    • http://peliconstruction.com/uploads/1/3/0/7/130776081/5705894.pdf
    • http://foodwarrior.de/uploads/1/3/1/1/131163943/be627.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_off00005b7f.bin
5b382bdac4b7dee8bc20376053051510b022272a03cf3ca044d4e3858fcef743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7F 7688 bytes

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