Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a7699e9d81993…

MALICIOUS

PDF

84.9 KB Created: 2021-04-22 06:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1bcbc57ca08fa19593d3fbe7ce61d5fd SHA-1: 232636ccbe54ab536c5234384e104fc77597c484 SHA-256: 3d5a7699e9d81993842a74ec442a3901f06e06a5c87c8f46b921f8653d6c7da1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=forgotten+realms+campaign+setting+3.5+update PDF link annotation
    • https://cdn.sqhk.co/fujesepulo/L3sigji/how_to_draw_monster_high_skull.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/elgfjeG/badabizume.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/cX1HGus/gawewafupukotigofaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_f7ad9c2637e5428d9effaa5e7f2bf8da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a5f156-249c-4e98-8f4f-f024cc664b80/67750926941.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/manga_drawing_tutorial_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448868fb-2805-4a69-89b9-0cfbfc8be7cd/mezimu.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_939dc2019e144fd8bc32a421ff7f25e8.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/medivokosarapevavexitozej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8365ac2d-50c0-41fd-9afe-6f15e0781a59/history_of_the_world_i_guess_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deca1900-9ad8-4db1-86ef-86636336ecb4/how_to_do_backwash_filter.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_346243ea76dd4166b7d717f9ff53cf34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/294fb93d-3abb-41ae-969c-dc60e614bfac/22359731456.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/how_to_do_knots_with_rope.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/76290445148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0cfdf4-ac1d-4520-a9d4-88e600a8c6b9/how_to_know_if_there_is_acid_rain.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_9f57e5afde544a42b15cd771415fe8ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/duvelexakofufomivipe.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_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 5668 bytes
SHA-256: 41555c2f271a980bea1b07ede02279032a3bbecdc4417f2b30b6af4575e16b9b
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 11368 bytes
SHA-256: 2b9c3a8fd9c4b9b43484437ea17cd86ecb2934a32bf068ebf36bfd01922884cc

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