Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05ba0ca324fd234…

MALICIOUS

PDF

78.6 KB Created: 2021-04-08 06:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 609ad87df749e73a32b939822cba1520 SHA-1: 773a2f628369a388bc87b3606e534b998986e1e4 SHA-256: b05ba0ca324fd2340393116f761fe7da221eea631b63d1837777f34f0a673cbe
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as lures to malicious sites or to download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=formal+definition+of+booger PDF link annotation
    • https://cdn.sqhk.co/xasakeza/XRLirwi/allen_theaters_drive_in_las_cruces_nm.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/aqgijbn/thoroughbred_diesel_location.pdfIn PDF document text
    • http://pafewubeb.iblogger.org/bebinevodu.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/zoluxisab.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/vefaja.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/befusisusug-wabaxel-guporubax-jaruboweketakib.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/cjjhlig/13241110836.pdfIn PDF document text
    • https://jojumevowe.weebly.com/uploads/1/3/4/3/134314985/5995068.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/fiboia5/samsung_edge_lighting_plus_app.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://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_f6057aeb412940cd8f263aabd6cac282.pdf?index=trueIn PDF document text
    • http://fubageraj.rf.gd/breville_juice_fountain_elite_cold_press_juicer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bdfb1b-f32e-4034-8796-b17f00b67b41/kimojogotitugedulunejog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0a7554-2bd7-4f7c-bc5f-c391dc006338/lights_out_cast_david_spade.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_e7119281245b4e65afc2fd5c8d338959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8910a3c-4b1b-4903-906b-e048c1f42c0d/35689287024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b68d4aa-3d02-4187-acfe-f3523dd4c018/matlab_plot3_color_line.pdfIn PDF document text
    • http://bonilevugebenu.epizy.com/80831798046.pdfIn PDF document text
    • http://pepajefosub.epizy.com/hunter_s_prayer_full_movie.pdfIn 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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 4932 bytes
SHA-256: 9b70d7098b8aa4e39eb26c42a4f9d68b0f8eab596ab9b9f311fc0a72206d0b5a
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 11988 bytes
SHA-256: dda7c631687b6a178fae3fdd35ebad4e007a84975072b3f1ad41fa47b6373d05
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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