Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bf7e6caa2e704c…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 02:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 51cae73c99a7cd73b66b4cea940c8d62 SHA-1: 23b5534270108f3bdf7dae22058687afe239a993 SHA-256: 02bf7e6caa2e704cbb1afb9b35336218532ad7c02e1c47194f883367b8c6916d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically crafted to appear as a textbook citation, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=brunner+%2526+suddarth%2527s+textbook+of+medical-surgical+nursing+13th+edition+apa+citation PDF link annotation
    • https://latopekezap.weebly.com/uploads/1/3/1/4/131437375/7bcbadf0a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5ffd6063e2a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fdfddaa3c4d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5feeb61910771.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/886430.pdfIn PDF document text
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/abf7fb1a.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/faint_positive_line_on_blue_dye_pregnancy_test.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/nelowuxojewew-wotibutapomexa-zagebumolejaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_602821b35fd37.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/4761868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gototura.myartsonline.com/xagirajeteduguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faec5d0-a534-4025-99d7-d9fa6f4a6650/48385859179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9484b44-d10e-42df-98d6-b7a7ebe896ab/ensayo_libro_la_meta_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/the_ugly_truth_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/63533149821.pdfIn PDF document text
    • http://dogefifuga.rf.gd/rodonewakozazorotubabomad.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/tonatizi.pdfIn PDF document text
    • http://rubijisezet.epizy.com/stranger_things_season_3_neverending_story_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/nra_handloaders_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/somavufalakuges.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/english_translation_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead20a66-d539-4924-a0e8-b0690929aa81/12023539520.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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 4304 bytes
SHA-256: dea3cf14f8262a8b23389c8a3352314599a0fa45efdd7dd352b93a9e395592b9
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 11748 bytes
SHA-256: bf7a0f5ba6028818697105a77eb975d9f405b8431daacd4ca15f899cc5ab94b0

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