Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb895a565a33b498…

MALICIOUS

PDF

92.7 KB Created: 2021-05-21 05:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a40c5524f1e2e320c3ff4fec292addb SHA-1: 2205119231ee2583415e46f488c1be4f7195639b SHA-256: fb895a565a33b498635cbdaf090a8730b9c5ad12c9288e9340406ca0b715d81f
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 of which are to benign content, but one key URL, 'https://pelibifir.ru/strik?utm_term=draw-tite+5500+activator+ii+brake+controller', is flagged as unknown and is associated with a PDF_SEO_LINK_FARM heuristic. This suggests the document is designed to act as a link farm, potentially to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=draw-tite+5500+activator+ii+brake+controller
    • https://cdn-cms.f-static.net/uploads/4465687/normal_6039c6767767a.pdf
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/430140.pdf
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/6807066.pdf
    • https://diluzisapi.weebly.com/uploads/1/3/0/8/130814250/5908244.pdf
    • https://static.s123-cdn-static.com/uploads/4484363/normal_600858f0194f1.pdf
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/sorivev-goditudorax-vemokimapu-fojabinujuso.pdf
    • https://wejorawifaloju.weebly.com/uploads/1/3/4/4/134458418/weledavuzoka_gunifolato.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110e5db63e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/836a740b-124c-441f-93e0-4294df3c3332/bontrager_node_1.1_not_pairing.pdf
    • https://uploads.strikinglycdn.com/files/86fb5cd3-d81d-4dac-aa82-bc13c7b67cd3/tascam_portastudio_424_mkiii_replacement_power_supply_mk3.pdf
    • https://uploads.strikinglycdn.com/files/11350c08-9bad-4f65-ae59-5904be35476b/when_i_play_this_record_lyrics.pdf
    • https://s3.amazonaws.com/podawakumepewez/boss_baby_girl_theme_party_ideas.pdf
    • https://uploads.strikinglycdn.com/files/ca7250be-7de5-409a-828a-19d22e240b08/pozudobomufekiz.pdf
    • https://uploads.strikinglycdn.com/files/2a998409-b464-43e2-9abd-25261da022bb/harry_potter_2020_advent_calendar_list.pdf
    • https://s3.amazonaws.com/rozebofukixus/mewero.pdf
    • https://s3.amazonaws.com/rovuweraja/what_is_the_potential_difference_between_two_parallel_plates_if_a_42.2.pdf
    • https://uploads.strikinglycdn.com/files/d1d33324-0b79-4636-8448-302a5fa58869/how_do_you_write_millions_in_standard_form.pdf
    • https://s3.amazonaws.com/rirusozo/honda_power_washer_oil_change.pdf
    • https://s3.amazonaws.com/mubemutolewe/girl_guides_promise_australia.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/atltico_madrid_juventus_formazioni.pdf
    • https://s3.amazonaws.com/jevelel/71365993930.pdf
    • https://uploads.strikinglycdn.com/files/1807b773-f443-4609-b667-17ae21a6d4ca/82209724632.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_off00012cae.bin
8fbd523a07ac35eff549a5082fa2515faefccbab3e91de4b03e4749314154c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 5268 bytes
font_01_sfnt_off00013ed9.bin
fced2f5e9ac9d003e18fead582cc24d69ef6a2ae5656e5bc1107deca78ed0d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 11328 bytes

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