Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdbc1ccf5fdd82d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 23:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fcee5836eb9bf4de3666363c0feb04af SHA-1: a0e054f0a6b8e84e34dfda936b00c8d3e9ac17ae SHA-256: 4fdbc1ccf5fdd82d87030a58a6321878e24a3533e1cb505defff81ad643740a4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links pointing to potentially malicious or low-reputation sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/wix?keyword=bosch+front+loader+washing+machine+manual PDF link annotation
    • http://megahit.space/subject_verb_agreement_exercises_with_answers_for_grade_6tkzsd.pdfIn PDF document text
    • http://visiblawty.com/bar_bending_machine_manual0rg92.pdfIn PDF document text
    • http://vermono.site/zepiriludar.pdfIn PDF document text
    • http://13millions.store/mage_hero_denied_reviewayj9y.pdfIn PDF document text
    • http://cmbespaceclient.xyz/bangladesh_day_listqrnsn.pdfIn PDF document text
    • http://vipmanmarket.space/jizetajoxuyblak.pdfIn PDF document text
    • http://titoto.xyz/how_do_i_reset_my_digital_carrier_thermostat3tv7v.pdfIn PDF document text
    • http://uuuuull.space/siwurofomepu7rlda.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/cbf3d162-0653-426d-9b06-5cccf2adfe90/what_is_the_general_shape_of_mp_curve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3478faaa-2874-44e2-91d1-f2b034583eb4/what_is_a_calling_card_cod_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35f7e5e-9e93-4798-8e86-1ac6d543ffb9/grade_5_math_practice_book.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_9fd63d7037e74ffbbc8ec71cc15eaad8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec344d30-0a50-4b1d-a6f1-9a8d1e0335a6/90527447040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c230eb-cde0-4ea2-9574-972627eddd24/lewuzurenuwijeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7373fa32-25e8-4612-b9c4-687346de11b7/20416993335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefb5ff3-961e-43ac-abd1-3b5ebefbf8a0/how_do_i_fix_e1_error_on_my_air_conditioner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037719b4-d3a9-4df3-9b7f-c873a1032bda/how_do_you_write_an_introduction_for_a_research_paper.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_209a7ac3806e49939357f695446a6101.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5576 bytes
SHA-256: 69f249fea6d0dfaca334ba073634e8a2aeb345074d081de9bfb8b4f509f1f8be
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10796 bytes
SHA-256: 0a77335889222842948a1f1b5037035d85ba65807dbac4a95d26d877ea896388

Open this report in the interactive analyzer, or submit your own file for analysis.