Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83d65aa686500d7…

MALICIOUS

PDF

96.9 KB Created: 2021-03-24 05:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f33439b6342db9ea67b9e5bb9c66dcfd SHA-1: 81fb1d82c3fe8e87c2401c2fa31fec3355f26cd6 SHA-256: d83d65aa686500d7c42d050b4c6924003033e8d72bc7fc77fa08f873ebfe59c1
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is designed to redirect users to multiple external sites, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=zebra+zp+450+ctp+manual PDF link annotation
    • http://shop-kid-toys.online/cbrn_1_report90j5y.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/egjVhjc/19339566690.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/gcihAhg/23418444019.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jhhlEiC/a_lone_star_heroes_love_story_series.pdfIn PDF document text
    • http://naturagrush.space/half_blood_prince_book_plotr0j1v.pdfIn PDF document text
    • http://shtancircul.site/daring_rakhwala_song335kx.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/hjBhaji/jivime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_b64f8e41a63a4af3ba2cecdc4e9d7ebf.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_2670e27ef4654574820392bc4a38bea1.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_bf1dafc5a9e54489ae33f40031cbdabd.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_887c55ff945544e9bf05a5189593ce74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cc8fe3-b0e2-4d6d-9d4a-80a1e1d5f2ab/dubakudiwanomovavodoked.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/kogubuwadasadid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100da84a-557e-4eef-9b40-f654ba6ba281/46702676064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceeb66d8-a8b0-45c7-b162-054eef0b7bf9/tululakipafugijekekupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb75801-819e-46c7-8c51-3e1345ac15d5/bose_sounddock_10_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/romeo_and_juliet_movie_packet_answer_key.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_eea8316894b44e57a0ce2b8efd7c6fcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/acls_recertification_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/whirlpool_gas_range_wfg505m0bs_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c009a3-4f11-437a-bd19-ab41f7818d1d/batman_killing_joke_joker_origin.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_off00013c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C22 5400 bytes
SHA-256: 4561f3d50300f1b73a9da0d224ac4f9541961830c3e75c4d74d4e889391a3d2c
font_01_sfnt_off00014e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E79 11896 bytes
SHA-256: c3df755867f1da37aace95d8163dd7f5ebf0010a3618504d48090d742ee0723b

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