Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6d65db201dd16…

MALICIOUS

PDF

72.0 KB Created: 2021-03-30 02:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9dd49b99a9b0fce5257639a81025ae8 SHA-1: 90b161020a39301d8f7aac556c85b2a30c053927 SHA-256: 8fc6d65db201dd16ef0f04f6e50dd74319b70b285b05f70175a3a160e13f0f65
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a PDF SEO link farm. The primary external URI points to a URL that appears to be part of this link farm. While no scripts were explicitly extracted, the heuristic firings and the nature of the links suggest a malicious intent to redirect users to potentially harmful content or to manipulate search engine results. The ClamAV detection further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=ancient+greek+gods+and+lore+revisited+pdf
    • https://cdn-cms.f-static.net/uploads/4449965/normal_602f79392063f.pdf
    • https://cdn.sqhk.co/nozedimasav/dhjgigc/to_the_moon_phora_sample.pdf
    • https://cdn-cms.f-static.net/uploads/4384821/normal_606006c220164.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/9337af661c.pdf
    • http://walolexokesufa.sportsontheweb.net/kijelimarok.pdf
    • https://cdn.sqhk.co/pefisemise/cjfgeia/travian_kingdoms_elephant_finder.pdf
    • https://gurosutu.weebly.com/uploads/1/3/2/3/132303194/45bf219188.pdf
    • http://rejemezurufoveg.mywebcommunity.org/calculus_101_book.pdf
    • https://cdn.sqhk.co/bumajanivosi/b16AHih/velaxefopejazabemaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_b2aa490d8e10487998f8352604d181ff.pdf?index=true
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_c35d4cefc1d54055addc6c04c90cbb8a.pdf?index=true
    • http://zipulosi.atwebpages.com/3110440599.pdf
    • https://s3.amazonaws.com/zalisujezajaje/happy_birthday_bhai_status_video_song.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_4faf6a98edab4ad38c1253205c9f5884.pdf?index=true
    • https://s3.amazonaws.com/kovezodepugov/fimugimodetapip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab7.bin
71471671f0f2e07d74d78732e247293fff69dd0c06774615ddc14154004a376a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5436 bytes
font_01_sfnt_off0000ed57.bin
375fb0d79c86852d9a788d86a4041573fe680d7fd3eb63f2abbbe888aaaf070d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 11108 bytes