Malicious PDF — malware analysis report

Static analysis result for SHA-256 86287af1bb736f20…

MALICIOUS

PDF

78.8 KB Created: 2021-02-22 10:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0fd3a9bead6d01337dde790ef07bc603 SHA-1: a55bda7531ebe0b80edb0ca908089a2162cf7ad1 SHA-256: 86287af1bb736f207708a026e4e0623e4d8d4d4784f3b8efcadb9c524b28ea39
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The primary URL mimics a search query for a common technical problem, likely to entice clicks. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wb?keyword=samsung%20tv%20won PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/rixezajugopaza.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/hagfgju/god_of_stickman_3_mod_apk_happymod.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/Grjghci/shark_attack_full_movie_2020.pdfIn PDF document text
    • https://roponisuzarepi.weebly.com/uploads/1/3/1/4/131452815/3dba09968772f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5fefc77a0c821.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/hbRjjhj/13408723281.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/3946463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_6007c49ce2483.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/sirulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fcd4fbdcadc1.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/fig4igE/xekigoloruzelowixanujog.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/sevitofaposa.pdfIn PDF document text
    • https://mekowoto.weebly.com/uploads/1/3/0/7/130738632/9048465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_6021c28142eb2.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/e43c83bf0225.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/cgaffinetransform_rotate_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_601df78b02a91.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/R35G7YO/72137081486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giratas.epizy.com/extraction_of_essential_oils_from_aniseed.pdfIn PDF document text
    • http://lezujepadu.rf.gd/fuzolotafozagej.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 5668 bytes
SHA-256: c6dfb1850e87fcd31d6c60f0b786c781b3e97eeb5ff53d87bdbb6605fbd9f4fa
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 10800 bytes
SHA-256: 1ac6f60bdb66a3311da0be6484fa3b95a01c33876f95b2518702c677e3a81826

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