Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b0d1022bfd0328…

MALICIOUS

PDF

103.7 KB Created: 2021-02-21 19:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 70a98074ee0087e19a5458ded44305a0 SHA-1: 4328cc1d7a0d4be6ce39c32a120e7a5e40c4df51 SHA-256: a3b0d1022bfd03281a9557378f045e6d4208305d3ffd7a2cb889d4cd285f2a1e
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, with heuristics identifying it as a link farm potentially leading to malicious redirectors or phishing sites. The presence of numerous external links suggests an attempt to manipulate search engine results or distribute malware indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+leftovers+plot+summary In PDF document text
    • http://quinzsy-studio.design/simplified_block_letter_format_exampleshiqh.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ct1xJVJ/amtrak_route_map_northeast.pdfIn PDF document text
    • http://bigtittybella.com/surreal_numbers_bookfdp1f.pdfIn PDF document text
    • http://copyrighthelp.info/mavobev12y2.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/cigjiLJ/cruise_planners_travel_agents.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/vasilogedo.pdfIn PDF document text
    • http://wonder-ita.fun/91574870990v4lk9.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/h22jbwF/waregusejiwekunune.pdfIn PDF document text
    • http://the-job.ru/20958615897f1j0b.pdfIn PDF document text
    • http://qwonder.space/vonagikazosadezupegesolep44q12.pdfIn PDF document text
    • http://kalavar.xyz/what_are_the_five_ways_discusses_the_proof_of_the_existence_of_god_through_the_use_of_reason_brainlydgyrp.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/i4YdUhe/xodimirajaxet.pdfIn PDF document text
    • http://slampochka.ru/ferevajavaa0aty.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/lgde9hc/bingo_caller_free_download.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/wokobasu_nulajinawuwaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/gd8idjc/painted_pumpkin_ideas.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/tinem-jafefuduriru-dagida.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/mCyvifv/where_to_buy_electric_train_sets_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobisojew.epizy.com/sifilapetanevis.pdfIn PDF document text
    • http://daxeletibumu.rf.gd/how_to_reset_mitsubishi_tv_remote.pdfIn PDF document text
    • http://puwokamavureme.rf.gd/d_c_manual_air_force.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_off00015a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A14 5252 bytes
SHA-256: 112ab39bab6f450b6f4f6d79e9f1f9c93450500350fe43815e2e9ec155040b9f
font_01_sfnt_off00016bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD1 11028 bytes
SHA-256: ea722a2c1953564d83153e0e7daeb0522f6687e5f4d43b7053e37611349d2f85

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