Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1daf12d2fc38d8…

MALICIOUS

PDF

97.3 KB Created: 2021-03-25 19:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d543ab0b36ef675fd194af962e93f684 SHA-1: 397d7aa1f38021a84177a868c1a95e3a703c4aea SHA-256: 3a1daf12d2fc38d816d447eb92f3080e05e8f64db3550dc4106e99934cef75cb
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, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scamming. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://xajibur.ru/123?utm_term=non+verbal+test+questions+and+answers PDF link annotation
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/4029719.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/zapomomakufip_dikidanid_tovuzajabevepo_zizamir.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/golopijiji-wadozutejepa-lizumekakup.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/vilefal.pdfIn PDF document text
    • https://dekewixamime.weebly.com/uploads/1/3/4/5/134516443/nefewakavoje-mejojudagawi-giwufipu-zuxozurasig.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/296c96ccd5a132a.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/2848622.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/bibuxujadofa.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/kibagik.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/d2a596611454239.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/nixinesidug_tututekadis.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/0ab9bdc.pdfIn PDF document text
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/batuludesej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://muriporufulov.epizy.com/tadovigatirodazefijifiwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a6072-abe2-42de-9422-f82f03ade038/davubenutadasazesimet.pdfIn PDF document text
    • http://lusiromipu.epizy.com/6448378417.pdfIn PDF document text
    • http://pomababotesu.rf.gd/what_year_was_the_amnesty_act_passed.pdfIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_e48d79509d184686a25ee5ede195a75d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c382a11-92fe-4675-bfb5-d4b74e562b3c/types_of_cognitive_biases_in_decision_making.pdfIn PDF document text
    • http://zugemixo.epizy.com/97881689594.pdfIn PDF document text
    • http://kenefokugoxetu.rf.gd/rexonewepekunofakemarifun.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_c2537e6765224030ae9418938c858970.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_3653564905c0431fbe98d50a36d8c6df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1711b5-f8fd-497b-85ce-55b4db5877b3/xomimugoredadujunewadu.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e3deffb33e30455cbf1b7e37da581293.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_fe30e1ff6fca47a6be72cc90de0e4b4a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 5088 bytes
SHA-256: 347ca75932f18376df5d000e659d6c0df06c89147708f847db54600d06195e76
font_01_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 11576 bytes
SHA-256: d0c1471ae4e57dec0f22faa7e82f149a913cb90f72c2b3fb6c59363c6a8f416a
font_02_sfnt_off000167bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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