Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3212b6f5a61a4d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-20 10:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b57f5aae850d0f9c0635b155b35d9f8a SHA-1: 22046477da185f75f4fb4f509391840e8a5d7e0b SHA-256: 5d3212b6f5a61a4d91ec05e2a275858616c05908cd018ab335348ffa16a3f39a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services and suspicious domains, indicating a link farm or SEO manipulation tactic. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=vw+service+intervals+uk PDF link annotation
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/komejifumovape-zituzas-jikapunimipu-kizixud.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/1163009.pdfIn PDF document text
    • https://nefarixutasirov.weebly.com/uploads/1/3/1/6/131606035/7615341.pdfIn PDF document text
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/662190.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/wobaju.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/a22066b7580f79c.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/makolurafevorapewa.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/55b3694134af198.pdfIn PDF document text
    • https://revevapeseguv.weebly.com/uploads/1/3/5/3/135387876/vojibixogenefefutog.pdfIn PDF document text
    • https://jisuzinux.weebly.com/uploads/1/3/4/6/134671095/9bba09.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/1610673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/330e2ab2-143c-49a7-8663-8a7a3815b12c/what_is_psychology_of_religion_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6208b2ec-94fc-4ea0-9490-efef97d8f3a5/zobut.pdfIn PDF document text
    • http://sewadereweben.epizy.com/ropafuzuwomutorufupir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf424ec-4f2a-45c9-be4f-d7ae6d10bbab/dunosuburunekaror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26150e30-93e7-40f6-a359-9f4b3f8db823/nukun.pdfIn PDF document text
    • http://sijomowekiri.epizy.com/mofegefu.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/wakozomadabaxepoborefaf.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/problemas_politicos_en_el_mundo_2020.pdfIn PDF document text
    • http://zarevarepi.epizy.com/5366022955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295ddf89-e361-4ee8-ba1d-c766da8f7611/multi_step_math_word_problems_4th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 4748 bytes
SHA-256: ce7ee3134780d069b5d374bcada12f47b5f01074cc24298779d509770c4c256e
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 11236 bytes
SHA-256: 01e43d48bd31ce08e5eb2b1acdf5fb0c5065aa74a447acc99dfa05476fe9046f
font_02_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c