Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e4a94cff6527d6…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 07:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0cdfc73fd9ed68b17cfea8ea7c0c5cb4 SHA-1: 27deccdb96c344ca7435e93c1f47b4c4e641fce4 SHA-256: d4e4a94cff6527d6e56a2578a3bc70c5baec3e52dd6d49d0a538f7a6519245f2
186 Risk Score

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 SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/wix?keyword=catalizadores+rex+tijuana PDF link annotation
    • https://ripilebaxozeduv.weebly.com/uploads/1/3/4/2/134266308/zegibega.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/zoruril.pdfIn PDF document text
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/5315e8615fe7b2.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/gogemusos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5ffa7a6094a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_603a77c8eddc9.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/2c2450ad9dc895.pdfIn PDF document text
    • http://juvugewit.iblogger.org/paper_chromatography_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_4a4e01e0bb2846b598c7cd258971ac01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/biology_notes_form_3_advance_africa.pdfIn PDF document text
    • http://sirepirujigega.epizy.com/nidodamozovuzijegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b4e127-cb91-4eae-8341-a40bddd2d6ec/tuzipitopekomotopaxetis.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/gaditozefotomaliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78a271e-b172-437e-bb61-39482c14882d/free_math_worksheets_for_college_students.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_04ca4259610c4d68aceff186e0c757e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/52434309369.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/77006689433.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_ca92b2a2ed2148059f949d22c4378a99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/154b5495-c052-4c10-90c6-d2625b050b63/world_physical_map_with_oceans_and_continents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c6de24-3264-42a5-933c-e5b4d4620242/how_to_hold_a_lacrosse_goalie_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7042914-55d0-4875-ac95-d1d1d14554d5/safe_haven_sales_rep_salary.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 4916 bytes
SHA-256: e96d27d02c34ccc1244502b4c334b5644995a6816728ecbc0e24aaf2e46acdd0
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 2052 bytes
SHA-256: ac7b0a74effd872bd777ba3f3082f2a336561b813e37e8e706b5a656a00ec6d7
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 11372 bytes
SHA-256: abd55e57d57527dfc38de26a7de79acfcc7a257959fff37910fb213a135ed19c