Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c101a8faff290b3…

MALICIOUS

PDF

96.5 KB Created: 2021-01-10 18:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 49a1ee59fb1b0c4aff8a9ed5053d22c6 SHA-1: 71ce9b9914ce1f7f256cae916d17dfcef2278eb8 SHA-256: 3c101a8faff290b305b795a313c23d1b2f87ddc58f0a6b3f53ec2e00d9c97a19
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector further supports the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

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
  • 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://traffmen.ru/123?utm_term=quotes+about+democracy+and+dictatorship In PDF document text
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/6223357.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/hhhcsZF/tanks_royale_2d_battle_royale._io.pdfIn PDF document text
    • https://site-1173456.mozfiles.com/files/1173456/battlefield_1_tanks_in_the_desert.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/ggjibLv/ravens_steelers_box_score.pdfIn PDF document text
    • https://site-1172679.mozfiles.com/files/1172679/troostwijk_auctions_netherlands.pdfIn PDF document text
    • https://site-1174146.mozfiles.com/files/1174146/az_screen_recorder_v_2__5_apk.pdfIn PDF document text
    • https://site-1188419.mozfiles.com/files/1188419/kimadexaviku.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/jc1GgiA/final_fantasy_portal_app_points.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/fNij15P/clay_pot_craft_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/igifnhf/16959943424.pdfIn PDF document text
    • https://favopitovuseb.weebly.com/uploads/1/3/4/4/134455409/jorapa-nepejoriteg-bojineti-jorib.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/tekubidagi-gugepe.pdfIn PDF document text
    • https://site-1196120.mozfiles.com/files/1196120/transfer_case_fluid_change_silverado.pdfIn PDF document text
    • https://site-1168264.mozfiles.com/files/1168264/old_vegas_slots_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015337.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15337 19816 bytes
SHA-256: 6ead40fa4fcc16af759d84d434942e4caf3f8cfdc59ba64c641187c25cbb27c1
font_00_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 5584 bytes
SHA-256: b96390bee02a15e0513ae13275285fb2abea223b1250f1641a6549076656b5c3
font_01_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 11196 bytes
SHA-256: dc7db07587ed966907938fb17ab897b04a893411fd59a5fd2b771134407d2044

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