Malicious PDF — malware analysis report

Static analysis result for SHA-256 af86240a0590dce1…

MALICIOUS

PDF

80.1 KB Created: 2020-11-11 03:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a0ae808921462731f8b533cd4409505 SHA-1: d0f35cea13bc4b0fc231d11a8bcd9157f8999cd3 SHA-256: af86240a0590dce19b64fd30b031253e074edc99be56baca93f577ae01c2a7f7
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it hosts a large number of external links. One of these links, https://trafficel.ru/aws?keyword=comcast+augusta+tv+guide, appears to be a lure. The presence of multiple external PDF links suggests a phishing or content-farming attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafficel.ru/aws?keyword=comcast+augusta+tv+guide
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/7646413.pdf
    • https://cdn-cms.f-static.net/uploads/4470029/normal_5fa3e5ef7c780.pdf
    • https://fimuxexepal.weebly.com/uploads/1/3/4/6/134615427/sawaso.pdf
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/wulej_nizufezesoto_mobovutop.pdf
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f947b9e608f5.pdf
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/boninebigugugetuditu.pdf
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f8a0758dadc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/roblox_2007_download.pdf
    • https://s3.amazonaws.com/kagedatabujo/centralia_city_schools_district_135.pdf
    • https://s3.amazonaws.com/jumedemimo/lullaby_of_birdland_cm.pdf
    • https://s3.amazonaws.com/vigevot/butcher_block_dining_table_set.pdf
    • https://s3.amazonaws.com/nokiva/tazuderuboxigaxa.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e726.bin
83843fffef599d85c9f3a9079b487555d0d5a29ddf29966dc2316958ce9fb16d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 5096 bytes
font_01_sfnt_off0000f86f.bin
2f160aac6d82ddbf0e18d3a89403d9c15fff30ebb19887806c26273ff86f427d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 11532 bytes
font_02_sfnt_off00011e83.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16140 bytes