Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6416a25441f1d64…

MALICIOUS

PDF

77.7 KB Created: 2021-04-08 03:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d80c8b54b6a4c5646c92d810a5c7bb77 SHA-1: 416b31d5da775ed9a69d2b4b1f7d0d5995b62f56 SHA-256: a6416a25441f1d649c307935ca807afc2676fdde3364552f527548d9d595a580
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://bologen.ru/award?keyword=basic+house+plan+pdf', is presented as a house plan but likely serves as a redirector. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

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://bologen.ru/award?keyword=basic+house+plan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414867/normal_6030dd12ce02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_604472b48c158.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/difewevorekokojujul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600d2061c3a0e.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/runixu_gokebugutizewem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5fcb63967d962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_601224e23100b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_6012c7bf64319.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/developing_tactics_for_listening_third_edition_student_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_6031d9529e2e7.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/xajusuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601241de57a5a.pdfIn PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/ad1fa424ab3c.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/a6990473-9522-4e02-8237-b9aa9cbe9d64/oreck_xl_air_purifier_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f254e6c2-9f4d-4cb2-8acf-78017130ec0e/transitive_and_intransitive_verbs_worksheets_grade_6_with_answers.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_356f1b3c56b1430d9b64c17449c63a43.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_73982082311144f99683a00c0fb099e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fcd81a-a665-49a0-b78e-934babe67f0e/sevawavadewusenix.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/43258312702.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_691bb177163943358c3661ae8b6641de.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_6a7196f2bdfb4f34ab723090c0db191c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be97ac21-b76d-4361-8191-9253ee072ca7/polycom_soundstation_2w_non-expandable.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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5196 bytes
SHA-256: c534433849fc2703ebc86e56ef2f6ea9621d114d4fcc87a9a391334e20559328
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10640 bytes
SHA-256: 0ff2ba718a376976584f0c632a91cafd8f29618d02bdc8e6f39a1863b42c96b8