Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efd9b772fe50446…

MALICIOUS

PDF

90.3 KB Created: 2021-03-19 11:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c85b69dfc68fe7b3c583af263bf05f SHA-1: 2c28610e9e13efb42ba70c4711bfcfd589d0ecc2 SHA-256: 5efd9b772fe50446c5afc3fadb6603b7e17784d902cf0427105bd5f92f89e8e6
226 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as an advance-fee scam lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a byproduct of the PDF generation tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xezojetit.ru/123?utm_term=the+caucasian+chalk+circle+pdf+free
    • https://ranelelopo.weebly.com/uploads/1/3/1/3/131380755/kirarirafof-runim-kelivove.pdf
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/jaweba.pdf
    • http://hookup157.online/un_monstruo_viene_a_verme_descargarw4vqe.pdf
    • http://recepty-dd.info/how_to_write_egyptian_numbers1xrlu.pdf
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/8d68580677504.pdf
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/3e8e8afbceb6d7a.pdf
    • http://form-lnstagramverifiedbadges.com/37588675668bso86.pdf
    • http://maxist.ru/33129941009jahr7.pdf
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/8828522.pdf
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/ligafobibetiji.pdf
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/fukenukojuzoxu.pdf
    • http://presente-top.store/grade_5_english_worksheets_south_africai4kcx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_be891237597b42aa8e287d5bd6d7f08e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de4d970f-6163-47a4-a85a-8956ee48c448/modern_physics_tipler_5th_edition_solutions_manual.pdf
    • http://dozosimiwotug.epizy.com/witojukizipiniliwoje.pdf
    • https://uploads.strikinglycdn.com/files/13c4bde3-67f7-4227-9c15-9fc47e482117/first_day_of_school_hillsborough_county_2021.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_c1763f1560e64d258a8b62d60118fcf3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98f9398e-8b1a-4fda-befb-8a9be80741a2/how_to_insert_a_book_title_in_an_essay.pdf
    • http://gonatiw.rf.gd/ragurowegejipeloxita.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121de.bin
86afea36af357f8ce76cae28969b593a57ceeadedc1ee358caecd84526ac1d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 5256 bytes
font_01_sfnt_off000133ba.bin
5656361cdddab4b269bd222b12a1e3a785f399651ea75f7d7e1421b1c7ab2595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 12072 bytes

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