Malicious PDF — malware analysis report

Static analysis result for SHA-256 906cb4d528e6146c…

MALICIOUS

PDF

83.3 KB Created: 2021-05-22 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e4c64687dbddd98ba34e361222ed15a SHA-1: 69a155a16ea4971503b2d8cf01b45addad109322 SHA-256: 906cb4d528e6146cfdb365d9e58733f9a367166c942910d1520ddf6e2498b007
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/wb?keyword=como%20hacer%20una%20hoja%20de%20vida%20para%20practicas%20profesionales
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/dupozebatolezix.pdf
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/vozafotamijuverebo.pdf
    • https://cdn-cms.f-static.net/uploads/4489264/normal_6049d4a967a72.pdf
    • https://tekagegi.weebly.com/uploads/1/3/2/7/132740997/82747d91c734.pdf
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/pelenilunajaxox.pdf
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/bajupasivetejakele.pdf
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2a627ee83a.pdf
    • https://bijadatexate.weebly.com/uploads/1/3/4/0/134013249/lojegulofexeneg_bubitaxa.pdf
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/ridox.pdf
    • https://cdn-cms.f-static.net/uploads/4386828/normal_603fd12288368.pdf
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/7534d57.pdf
    • https://cdn-cms.f-static.net/uploads/4379726/normal_60144cd175251.pdf
    • https://cdn-cms.f-static.net/uploads/4379618/normal_601ee2beb0f38.pdf
    • https://cdn-cms.f-static.net/uploads/4466408/normal_60405c84e843c.pdf
    • https://debotokatetore.weebly.com/uploads/1/3/5/3/135345182/3789863.pdf
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6010051cd0bb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/892d8a33-0dfa-4538-8c53-80534a2977f3/should_the_word_professor_be_capitalized.pdf
    • https://uploads.strikinglycdn.com/files/7a979202-9e43-4ef0-b197-8004d0d8d254/sap_outline_agreement_number.pdf
    • https://s3.amazonaws.com/nelizenejakarug/wasivenaviwu.pdf
    • https://uploads.strikinglycdn.com/files/bafa1bbc-1a33-403c-9000-1019a7b0b866/mesefozeduninumisunataj.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/what_animals_need_humans_to_survive.pdf
    • https://uploads.strikinglycdn.com/files/3df93ef2-f8a5-4ede-b711-e44ccc8e41c2/how_to_play_family_feud_christmas_game.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f539.bin
c56300d97727432307dc8ebc1ce781a6f69bedd6f469407747ddfb1227d439f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 5436 bytes
font_01_sfnt_off00010799.bin
4ec4dcac19f31668a720195776ebcef44c7b71884fe81f4bee265a6683c9f1cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 12232 bytes
font_02_sfnt_off00012f7f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 4324 bytes