Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cdcd423832324d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 10:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9dbcc89d43123f947d699366d2db419f SHA-1: 48ea5f3ac4bf41442bde5949c57b9bfcaa8c2956 SHA-256: 72cdcd423832324de69b343cca2069b6b8e7bfcef23c4f62facbebeba5099be6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous external URLs that point to other PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and a link farm on disposable hosting strongly supports its role as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=song+pittsburgh+polka PDF link annotation
    • http://cmbmarketing.agency/babewapesoli3dzku.pdfIn PDF document text
    • http://clientesdkb.com/c_e_a_ka_full_formhfwxn.pdfIn PDF document text
    • http://legalvictory.group/60217154672joxn4.pdfIn PDF document text
    • https://guzaluvezitalil.weebly.com/uploads/1/3/4/6/134645516/vamosikigamukeweku.pdfIn PDF document text
    • http://robinmani.site/examenes_cae_resueltos9d3wz.pdfIn PDF document text
    • http://ig-support-service.com/little_house_on_the_prairie_season_9_episode_166oyqu.pdfIn PDF document text
    • http://cheatyou.site/ddo_monster_savesixt13.pdfIn PDF document text
    • http://iglivesupportteam.com/17321173347k1o7i.pdfIn PDF document text
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/3264869.pdfIn PDF document text
    • http://ketadiets.site/canon_mp250_manualld2ts.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/293bf6d.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/bemoza-latalixapovik-vetuwoda-nafogagiwatem.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/wovematur.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/b648779d20b.pdfIn PDF document text
    • http://vibawukukar.iblogger.org/85107291976.pdfIn PDF document text
    • http://money-team.site/9163359486idv9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinigites.epizy.com/java_programming_book_bangla_free.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_60e2a3b2b2044bd6a3290ede17883b53.pdf?index=trueIn PDF document text
    • http://talizojewebovob.rf.gd/aashto_pavement_design.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_d91fc21e88434ae696d50b1b10da5bc4.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_51f01dbf3ce14cd2b5044879a81688ca.pdf?index=trueIn PDF document text
    • http://bolilolu.epizy.com/cavendish_school_hemel_hempstead_uniform.pdfIn PDF document text
    • http://pojurevowope.epizy.com/lojetubuwibitabodawo.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_da1542a4fc0d4cd48eaa1c4f95c02d5a.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_d7cda8550ab04e6fa3a421565f4796f6.pdf?index=trueIn 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5388 bytes
SHA-256: ab778e8a961938f2db0175edcf79a79cbb22e79a286062e97f4533bc2f9d355a
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 11724 bytes
SHA-256: b9207f95afc282e0e924d263c219686491629024bb9d0396c6e7016bd1adf159