Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8e9c9b7bc88140…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 18:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2cf84f8e25b9257c746e0cb9c0986b5a SHA-1: 16ca126f730b6815227665864f51b81d31c2b0b8 SHA-256: ab8e9c9b7bc88140f9f4071bc0315ffbebb28a96a675dd2286f4acbb3a228b7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm designed to redirect users, likely for phishing or malware distribution. The presence of multiple unknown reputation URLs suggests a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=how+long+is+the+army+ranger+pipeline PDF link annotation
    • http://vvinorama.website/dodetixinutajejogapegie64t9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601b378bd53dd.pdfIn PDF document text
    • http://promooffer.site/word_definition_drowsyu6qpo.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/21561153488.pdfIn PDF document text
    • http://freedate18.xyz/verizon_fios_channel_guide_201953ubr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_602f02789aa1d.pdfIn PDF document text
    • http://hookup153.space/chick_fil_a_starting_wage_ncintm0.pdfIn PDF document text
    • http://funewiwawako.iblogger.org/mibitiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411700/normal_5ffba1c2cdfce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_6051503482e2f.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/wanalowari.pdfIn PDF document text
    • http://shop-kid-toys.online/janome_hello_kitty_sewing_machine_foot_pedallrg67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f2ac60-3de3-46d7-9299-062d2a9966a2/what_is_the_best_strength_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497e8aae-2b2e-4e6c-b306-35b6797aea6c/how_to_replace_whirlpool_bottom_freezer_ice_maker.pdfIn PDF document text
    • https://16819e96-1bc7-4f52-9ee3-8725b42b4999.filesusr.com/ugd/3283b0_4b2349013ef649caa55a04c3d1848e56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e84673-34e2-4358-8543-91f7688f508d/why_is_my_pet_trainer_collar_not_working.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_5b8535cdd77e4335a41168547ca06863.pdf?index=trueIn PDF document text
    • http://zerisonapuki.rf.gd/adiemus_lyrics.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_69beebf81fac469d9d2534c0a26cc549.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 5388 bytes
SHA-256: 1400b7b958880ef7f2fd6777b912bf2d8fcfb67b7f9992d3cf09f8a807ebe3a3
font_01_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 11376 bytes
SHA-256: 070d2c4a032cdf117045a048f909eb578c950fe8146e9ed45b1916edfcbfc5ef

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