Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f812a51fc4e3179…

MALICIOUS

PDF

73.9 KB Created: 2021-03-12 06:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 556536cf53599f9c8d288d4cf776bb8d SHA-1: 3d66a70ef9988e7e21daadd60a0e36cdb38ecc23 SHA-256: 0f812a51fc4e31796ca4b7dc087e2bff7e8179f5e209c85acbd40b06b6f69222
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various domains, many of which are flagged as malicious or part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifies a link to 'crophysi.ru' as a known malicious redirector. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate the document's purpose is to host a large number of external links, likely to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the nature of the link farm suggests a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=jump+rope+dudes+calculator In PDF document text
    • http://topsale.pro/relative_clauses_exercises_with_answersvbpju.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/fitonadakikobekira.pdfIn PDF document text
    • https://vijunisuli.weebly.com/uploads/1/3/0/7/130775087/fedexonazowerozumije.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/oxford_house_dallas_texasehi91.pdfIn PDF document text
    • http://1gusevshop.space/jibexaweneflj5v.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/c04440.pdfIn PDF document text
    • https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/kafukorevora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28ac156-742f-4483-82c1-9f10d18ea01d/tapufogevogorer.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_cc5a9c2d89ce402a9a2aaf98b417d946.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a066159d-49d5-4c12-923f-5d54dcd8e184/what_is_the_purpose_of_man_to_god.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_b7e585ae7d714ecdadd2ab8f4dcf5315.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_1ffaf8dae8984703bde4e6c2cf14a799.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c158890-75a3-4055-86bc-5305abe3a74d/is_kaplan_gre_prep_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ced714-efbb-47ef-aa94-260622ef8911/rifisorigepo.pdfIn PDF document text
    • http://zafokofebub.epizy.com/89470697286.pdfIn PDF document text
    • http://xusixuxoribixe.rf.gd/vocabulary_building_exercises_worksheets.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_040d863c471048d3ad5823c19f08525a.pdf?index=trueIn PDF document text
    • http://taduzaxafoguj.rf.gd/what_time_does_black_friday_open_at_walmart.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_9c94df98a7654ac282d63ca86cdb37fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61988d89-db9a-439e-9483-4f24abf7717c/rirotenepabefizuze.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 5208 bytes
SHA-256: 99d25de43f6b077b1c9a9bfb309eeea228bbe4872084aae4cfaf828302d4280a
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10940 bytes
SHA-256: daf8927ecf1df4b42c836d34bf486996d74a6147bd4708f3001e1d5af9a85560

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