Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb9eb2ba1e532f3…

MALICIOUS

PDF

73.4 KB Created: 2021-03-01 15:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f934b8b0757f819c958ce0c75ac0c30 SHA-1: d8d79677f2d9cd62215d8315815e3efca87054b8 SHA-256: ebb9eb2ba1e532f355419e02b18d1a9b5d1aeedaeb9ef94ed945b44d4aa3488d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=interactive+pdf+video+ipad PDF link annotation
    • https://siroxejuvumuku.weebly.com/uploads/1/3/4/6/134657252/e725c5c6.pdfIn PDF document text
    • http://static-get.top/sample_food_costing_sheetswtd0a.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/siwowivekudatakuv.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/2fd2f.pdfIn PDF document text
    • http://gitilapen.66ghz.com/29_card_game_free_for_mobile.pdfIn PDF document text
    • http://betafiwes.iblogger.org/why_is_water_dripping_from_my_boiler_overflow_pipe.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/6494361.pdfIn PDF document text
    • https://gilanevevo.weebly.com/uploads/1/3/0/7/130739192/zozobusapixakuk.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/naxidavinevix_vuziluwijo_dofukul.pdfIn PDF document text
    • http://lofitner.buzz/track_caller_appnaejy.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/newatozulatalodaw.pdfIn PDF document text
    • http://tufowolulexa.22web.org/71511334589.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/8108590.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/wuzevefu-podewido-xomitexowosega-togap.pdfIn PDF document text
    • http://bigtittybella.com/pasirufili0gzr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowujobosega.rf.gd/fiwomitap.pdfIn PDF document text
    • http://fisolimemokuwo.rf.gd/jimadolefoguxis.pdfIn PDF document text
    • http://fukasutatota.rf.gd/cinderella_man_viewing_questions_answers.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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 4936 bytes
SHA-256: fdcf7ee25106180fe49226f3d24e2bee2ad65dc9ccb0cd29c682f33406c843cd
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10324 bytes
SHA-256: c7fba98ec7027b97e9148d1c189ad1bb68e38573cb09bbd19186ebfebac63a63

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