Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7512c9167caea59…

MALICIOUS

PDF

86.1 KB Created: 2021-04-06 08:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3f057a55cffcf7fcd2ce691c775e52 SHA-1: 7e496239b12b8ad7353caca057a81a69ad67d7a4 SHA-256: a7512c9167caea59392beea88a1d917bb36ba3807feb4d2628d528393689a20a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely leveraging a known exploit or social engineering to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/aws?utm_term=fl+studio+producer+edition+20.6.2+build+1549
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fe111351a08d.pdf
    • http://mebovedu.getenjoyment.net/97513768438.pdf
    • http://baditunabupiru.mywebcommunity.org/break_blow_burn_camille_paglia.pdf
    • http://sogejovep.mypressonline.com/free_piano_sheet_music_pop_songs.pdf
    • https://cdn-cms.f-static.net/uploads/4469103/normal_603d0d9616089.pdf
    • https://cdn-cms.f-static.net/uploads/4487632/normal_60680e97b9164.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/50072f14-3deb-4a5c-a7e4-4af7b265cb86/82154876126.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_c321f0db82334c38b5d1e862d41af877.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7cf1bd4-7c04-4701-9f90-2823f63a9772/79582670724.pdf
    • https://uploads.strikinglycdn.com/files/d58479e6-5fb7-45e0-96ac-6bc81ab1e897/badger_5_garbage_disposal_1_2_hp_insinkerator_badger_5_with_cord.pdf
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_bff3110311da4e6a9c0ac2978bca3b45.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_35c05dec07a34fd7b390d76415812532.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0fba240a-6d1c-4006-b7a5-23ec14c554bc/toro_subsurface_irrigation_design_guide.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_fe4b7d4811d840d186b655361f13cdf6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dafa7f0e-276a-4d8c-95a9-32921b17aeeb/falawinelufakojexe.pdf
    • http://tuwutexo.onlinewebshop.net/fenner_pin_bush_type_coupling_catalogue.pdf
    • https://uploads.strikinglycdn.com/files/7518f0f1-4726-48c7-a26e-62042a32c210/how_do_i_file_a_civil_complaint_in_pa.pdf
    • https://uploads.strikinglycdn.com/files/e39c9bba-0ffe-445d-b8c9-242945e76768/attack_on_titan_season_4_full_story.pdf
    • https://uploads.strikinglycdn.com/files/86ed4f99-f69c-489d-a59c-5ffdf97af539/over_the_hill_lyrics_led_zeppelin.pdf
    • https://uploads.strikinglycdn.com/files/de9a153f-31bf-4683-8c22-568146c4ec61/how_many_dragons_are_in_wings_of_fire.pdf
    • https://uploads.strikinglycdn.com/files/c66e4843-b2c6-4f6e-a89b-5ddf87beacca/74393661409.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_a683d9d4db374d4b92060d86d6828d9c.pdf?index=true
    • 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_off0000f471.bin
5431f2fa2aa35e64f87ec490f28fe387ab9e08fd193ac83f4e791a324a45f3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 5716 bytes
font_01_sfnt_off000107f4.bin
7dec044d2aaaaf75c974173275eded8a048d38707b179bdd3d5ecda58fd7fa7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16176 bytes
font_02_sfnt_off00013a1f.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 4324 bytes

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