Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad4881bb4d7cf89…

MALICIOUS

PDF

72.0 KB Created: 2021-03-28 00:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0cce515eb3acb926e5f679a5685fbe13 SHA-1: 879cd18632bd5b426661a3f39150456562e1addf SHA-256: bad4881bb4d7cf8911f74d1cf9c45b019efec2e762a21c0c495651d8d2279529
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing 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 sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=russian+english+bilingual+books+pdf PDF link annotation
    • http://wugilunage.iblogger.org/pdftk_command_line_linux.pdfIn PDF document text
    • http://jakijofuvi.iblogger.org/basic_terms_of_share_market.pdfIn PDF document text
    • http://jetavimazi.22web.org/33143931322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_605fb7efdc295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_6007d644f087c.pdfIn PDF document text
    • http://rukolofi.22web.org/chemistry_notes_for_class_12_chapter_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotuzibufuvonif.rf.gd/movulisenaxuvigezudoson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08530c3c-2ec7-4ca4-a1a0-d20672cfca3d/60637871776.pdfIn PDF document text
    • http://lerojijegomukuv.rf.gd/learning_italian_for_beginners.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_d4f4202a1b80435f9b395cfe6b62f901.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/354e29f2-fbc2-4931-a260-e481109cd472/72519507699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cae957e-2253-4e9f-bab7-e484e5931e13/shin_megami_tensei_nocturne_remaster_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420251db-8605-4368-98e9-085b7c60f3f2/why_guys_test_you.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_830b36157bae4727b65a567610a19b5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f88696-ae0c-4ef2-a924-c99841331fac/8145731062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b43cf9f-4d44-44b6-925e-5d4fa8ca3bae/74189171351.pdfIn PDF document text
    • http://jakurudapamole.rf.gd/lurugisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5562c3e-6f1e-435b-b1eb-4c49b48d8835/honeywell_timer_light_switch_instructions.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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 5420 bytes
SHA-256: 1a7d2fe080e8892430aea5043554f0fb49ee81e5a5de99b18950d22252f32363
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10804 bytes
SHA-256: 72eac5732d222e3a3f210f6560ba6f1cd268a9e3a940406e8893d5c2ecc2cc5e

Open this report in the interactive analyzer, or submit your own file for analysis.