Malicious PDF — malware analysis report

Static analysis result for SHA-256 756b7bdb40e39d1b…

MALICIOUS

PDF

83.3 KB Created: 2021-04-01 00:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db298340997e6abae8f8ac767f68306c SHA-1: fb4bebae3b0b679582fcd0a0cb7e05bfd6831f6e SHA-256: 756b7bdb40e39d1b22784095c72b28670db982312cd9ade448de4ad6cab2dd4a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://lozipotod.ru/award?keyword=teoria+de+augusto+comte+pdf PDF link annotation
    • https://cdn.sqhk.co/tategupet/jaieTjh/play_bubble_shooter_online_unblocked.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/f7d05475b8a495c.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/wgShapd/fishing_hook_knots.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/bbe2df0b0044.pdfIn PDF document text
    • http://naturebiolog.space/jovanilewopazuzabpelrs.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/642110.pdfIn PDF document text
    • http://thedefenseforge.com/childhood_immunization_schedule_2018_philippinescz8su.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/6c13d9b1-9124-409c-ae5b-651fc0cc1781/do_you_want_to_be_average_blood_pressure_readings.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_16260de34c0540eea520577925f69599.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0a2b4e-6f05-46f6-971b-264fea753836/daily_english_words_with_meaning.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_08bbb2bf3aaa4712ac40960c54216c2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae28e63-db09-4572-b394-b6001119f1a5/24254359110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2338da-d3ed-4e84-adbc-2728e07b4089/us_army_flag_pictures.pdfIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_bee505c3db2a4d80b248f2cba379f6f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb5092d-9e8e-4e22-a32b-5e4599ef552d/kilorugasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0141de0-f400-466b-a15a-68072ed0caf2/hp_elitedesk_800_g1_twr_gaming_-_gtx_1660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4791ad4-2218-40d0-be71-7f9040956b16/mcculloch_pro_mac_610_chainsaw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 5392 bytes
SHA-256: 67810229273dace309b42bd90760adc5f4d96f18208cbd5f020ae02f2e101adb
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 13352 bytes
SHA-256: 64d9433c71c3c7e0762103df5af5bad266164f627ae6cd685c263eab3eaf1371

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