Malicious PDF — malware analysis report

Static analysis result for SHA-256 7648d92a4f8fd950…

MALICIOUS

PDF

77.5 KB Created: 2021-06-03 09:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52413bca9adf2678033bd877663d9a9 SHA-1: dd6ff9790a52dae334049912ba975c7ad17183a8 SHA-256: 7648d92a4f8fd95091c8b165ddbec25ac4b84bc08c23327eb5d3a4e0555bacf2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to 'crewmak.ru' and a query string suggesting a lure for 'Whatsapp plus apk download'. The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF's structure and embedded links suggest it's part of a link farm or phishing campaign designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/pbw?utm_term=whatsapp+plus+apk+download+latest+version+v6+40+free+2019
    • https://tumirovuwepilu.weebly.com/uploads/1/3/4/6/134603677/fafizuz-kobiwul-xagozolugevo.pdf
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/gavevogodivotuput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a2e0738e-a19e-4965-89af-49df3e738f76/stealth_cam_stc-p12sfx_manual.pdf
    • https://uploads.strikinglycdn.com/files/1702788d-8b07-4905-8a23-ce8e99dd995f/listen_to_agatha_christie_stories_online_free.pdf
    • https://uploads.strikinglycdn.com/files/4c82d1ec-6db5-459f-addb-3291e61b8764/pawidodisumuwigetil.pdf
    • https://uploads.strikinglycdn.com/files/3bb196fb-18e1-4a86-9ac5-191bee8a4ab3/45980735652.pdf
    • https://uploads.strikinglycdn.com/files/6a9cb7a3-4144-478e-879f-590382e5fa14/detox_meals_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/b2b20e59-d6ef-4fd4-90b3-0f7312c91836/kenmore_washing_machine_motor_replacement.pdf
    • https://uploads.strikinglycdn.com/files/32852ec3-cb83-4fdf-80b1-9dbececf8e5a/13071903534.pdf
    • https://uploads.strikinglycdn.com/files/4394cf11-5260-4e04-925a-975907e1251b/34044482269.pdf
    • https://uploads.strikinglycdn.com/files/4fb14b3b-6979-4494-ae2a-18aef310f484/gifumozemabim.pdf
    • https://uploads.strikinglycdn.com/files/446ac29b-da35-4c45-b4ec-11d81454cfac/air_force_1_black_and_white_shadow.pdf
    • https://uploads.strikinglycdn.com/files/89888fa3-4e26-4c36-a518-0ee2ebf41237/what_can_i_eat_on_an_anti-inflammatory_diet.pdf
    • https://uploads.strikinglycdn.com/files/b8d54c2f-79b7-41c3-937f-eac40ce07e5a/which_northern_renaissance_artist_was_reputed_to_have.pdf
    • https://uploads.strikinglycdn.com/files/47531f07-1c76-4551-9fb2-a63097cc9985/thermal_physics_schroeder.pdf
    • https://uploads.strikinglycdn.com/files/20f5c2fd-bf41-46ca-8669-55ca7904ac0a/how_to_find_calculus_answers.pdf
    • https://uploads.strikinglycdn.com/files/58e11278-f7cb-4fac-be4c-52f0a53c8b41/soundlogic_xt_bluetooth_rechargeable_true_wireless_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/e9f2cf38-5835-4284-8b71-54567317ab07/rakamelur.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_off0000ee31.bin
04c68322856ac3f222b25b407810b7a357d7184b552a3a5f0d477939cee3413f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 6080 bytes
font_01_sfnt_off00010304.bin
be757f4688a7e1ec41e1344114a9394d6b91fa83a6e34433aec8f1dcd39c5747
pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 11012 bytes