Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba7dd9417761ef5…

MALICIOUS

PDF

75.9 KB Created: 2021-04-16 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 051764e97bc39711373790ece5207b44 SHA-1: 19fe920c285f71e9a2e94c53b2d23ca23f7a2607 SHA-256: 1ba7dd9417761ef5f5365a4cbc09f7349abe45af5b83f7c5fec50487c5c6b579
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=john+deere+mower+blades+48+inch PDF link annotation
    • https://cdn.sqhk.co/jotepomi/iifbKTQ/word_wallpaper_hd_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/TgdihwD/26486454351.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/krjdtFF/uefa_champions_league_final_2020_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/id1Ljco/rolling_domino_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hjhirC8/5825206799.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hchfhiT/jijotozufepuvaru.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/dCGjesX/difunisuwekape.pdfIn PDF document text
    • http://difedoko.22web.org/athlean_x_inferno_max_shred_workout.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc7d8d87b126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde532736e03.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
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_6e9403c6aeda494ca05956b5d9d7883c.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_f5af4f37fa8043ef9fd9dc24408abf0b.pdf?index=trueIn PDF document text
    • http://tefinavi.epizy.com/5544674076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9232b0-da0d-48d4-ab92-3d61de916688/how_to_use_bitcoin_atm_machine_video_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69533742-f0a1-4629-a954-d539248128b3/91343196486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc35c0a-f6f7-4a90-a8b3-96c155279cbf/worksheet_limits_calculus_1.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_8eb396690f23436b9f0ef1a98347e818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b948ae-9742-47dd-a3cb-825afb5151d8/hotel_restaurant_and_travel_law_7th_edition.pdfIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_2282cae82a2d4978baa370c34e1c6882.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_782d86ced8e644d594f71c6aa7d8ebb0.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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 5388 bytes
SHA-256: 8bf3fa3293322048dad84ddbc70732e0e8d8d133fd4619d96a2bac1dd426bb31
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10852 bytes
SHA-256: 722a3dcdb41ec24815b4e96980c74a092e8fb3f7d1026400efbafb480bef3505
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333