Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aaa29dc44a8288…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 21:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0b73478bf8e41a4361e005563c89bbaa SHA-1: 50e72c3a4ed38492812f27c6f1c1334249955923 SHA-256: d3aaa29dc44a82886118c9322dd05107b8a008dfc3b4b736781eff0fc62b3700
226 Risk Score

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. It uses a password-protected-archive lure. 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 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=apc+switched+rack+pdu+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470532/normal_6049ef162c40d.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/dd656d50167f041.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/7jjgIhb/54422846702.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/rupafikegowagorebusi.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/7a10c2bd8afbbc.pdfIn PDF document text
    • http://pumadem.iblogger.org/synonyms_antonyms_homonyms_and_homophones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fe1135486bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_600016b310fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_60275b2881e63.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/hjcd8Qg/ordinary_peeling_solution_benefits.pdfIn PDF document text
    • http://kibasemenatax.22web.org/can_you_warm_breast_milk_in_dr_brown_bottle_warmer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_604d6b5417e26.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/fililutarat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_7dd4d01f88054f229d39a7e25df5cf1a.pdf?index=trueIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_b7d93f41f4004a49814dab92b826c3d9.pdf?index=trueIn PDF document text
    • http://sivutesafukim.rf.gd/how_to_program_a_craftsman_garage_door_opener.pdfIn PDF document text
    • http://sedaxitixas.rf.gd/que_es_un_taller_de_aprendizaje_en_inicial.pdfIn PDF document text
    • http://gejaliwujabe.epizy.com/4334867490.pdfIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_0dde3f6afda04bdca5c80459ad701391.pdf?index=trueIn PDF document text
    • http://bulekixor.epizy.com/adductor_strain_treatment.pdfIn PDF document text
    • http://rorijurizugetol.epizy.com/gesujapuxumop.pdfIn PDF document text
    • http://jipowefata.epizy.com/event_marketing_plan_template_word.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 5272 bytes
SHA-256: eeb476286954da24322afe21de3d6646a7cb0162adbcc28f8a6e72cec7d8c0e7
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 11500 bytes
SHA-256: 1987aa99547bfed21c4624e0ca6439229adacc2117005e16a68cb6611ad3803c
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15