Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1574a0f5d8ab07…

MALICIOUS

PDF

90.8 KB Created: 2021-03-31 21:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67412f73bf828ef42a71a7148d1d7755 SHA-1: 1217c56370631a965537d9b78c70cd8b7a1ac91f SHA-256: ab1574a0f5d8ab07950c6659ff5be873020ad648ccd296a1647c16caa27077a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=how+to+write+an+introduction+for+synthesis+essay', are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/strik?utm_term=how+to+write+an+introduction+for+synthesis+essay
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/gibazis.pdf
    • http://about-fb-support.com/xemozumoladawukve34n.pdf
    • https://cdn.sqhk.co/wufevinek/8iaNiiK/mit_application_essays_examples.pdf
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/12b382d5f7842.pdf
    • http://fumumowovufa.mywebcommunity.org/kapuzenopegekujeka.pdf
    • http://fulokixowo.scienceontheweb.net/42834911399.pdf
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/naxigidegasula.pdf
    • http://itprod.space/babifujuj9xrcv.pdf
    • https://cdn.sqhk.co/sononipo/p9nzUhc/chess_game_for_computer.pdf
    • http://copyright-infringement.business/rockwood_pop_up_camper_partsk96yb.pdf
    • http://wosedumuf.mywebcommunity.org/adjugate_matrix.pdf
    • http://reduslim-sito.site/misowizenudupesuzed4mof.pdf
    • https://cdn.sqhk.co/pavupaken/LSxe7hi/78543717720.pdf
    • https://cdn.sqhk.co/purorelaz/fceQgdq/fesogexerizirulivawufo.pdf
    • https://zuwodavipufowaf.weebly.com/uploads/1/3/1/4/131408056/5503372.pdf
    • http://gallery-shop.site/49833750986kpsxk.pdf
    • https://dugaxopi.weebly.com/uploads/1/3/5/3/135305828/9396217.pdf
    • https://cdn.sqhk.co/dojikerujuwo/5jdNo74/analytical_chemistry_for_dummies.pdf
    • https://cdn.sqhk.co/vukupamita/dsCLvXx/3911152646.pdf
    • http://pmaider.com/nogasazdub.pdf
    • http://hookup158.fun/saat_kavram_parmak_oyunutt8t4.pdf
    • https://cdn.sqhk.co/nowavutu/jDWjbwA/movies_anywhere_app_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rewuwuja.onlinewebshop.net/encyclopedia_brown_free.pdf
    • http://mifotabelimudon.myartsonline.com/daweseduwekurufut.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_off0001193a.bin
14d92631b8da16484398d1045048b8fabf91da4efb7c9c2f82b55b2067a71fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 5116 bytes
font_01_sfnt_off00012aa3.bin
5812a2811ae3bb28ed020a19c7d771d8f25c976f3cba75694c38dac8e346458e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 10616 bytes
font_02_sfnt_off00014f00.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F00 4324 bytes

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