Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04d74bfd2219c82…

MALICIOUS

PDF

75.6 KB Created: 2021-06-07 09:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f3108102bb74832929d2508d283e6af1 SHA-1: c359fe743caa456d64e5eae24713bafc5044ec72 SHA-256: b04d74bfd2219c8278a41cc143680bc6d1c15cc56a42462af292b5429e4464db
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Printable calendar 2021 and 2022', suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=printable+calendar+2021+and+2022 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601c61e9ecd06.pdfIn PDF document text
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/lurapefutedix.pdfIn PDF document text
    • https://teveluzisobe.weebly.com/uploads/1/3/5/2/135299025/e0de4.pdfIn PDF document text
    • https://potamowirojix.weebly.com/uploads/1/3/4/6/134688714/4619841.pdfIn PDF document text
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/5654443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60600920167c8.pdfIn PDF document text
    • https://duluvozega.weebly.com/uploads/1/3/5/3/135327827/f4db29c71403e.pdfIn PDF document text
    • https://wutefojatix.weebly.com/uploads/1/3/4/6/134662353/e2ebbd2d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6799844-36c2-4f4b-9ce6-cd18913b9d15/22941698308.pdfIn PDF document text
    • http://xigikegom.pbworks.com/f/64631698756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9056f966-059e-42c1-a8c3-6d5aa0614e40/kavafuvoderodasevarifofes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30eacd63-46e5-4598-a99e-055618a6a493/movuzomeg.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144691620/clash_of_clans_ios_hack_no_jailbreak.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144710514/xigevawewafanukevomuvuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650d4f60-70a2-4bea-871e-c218a961c484/calligraphy_a_to_z_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a3d745-2fad-4f10-b748-b4208ef47a29/vobisof.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144449463/worksheet_12_simple_past_vs_present_perfect_tense_answers.pdfIn PDF document text
    • http://sowenux.pbworks.com/w/file/fetch/144770928/jefin.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_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 4900 bytes
SHA-256: 5136e988bdc79e37f0378745e7ed6b0bc8c7d258c575bb998374fe494a640d32
font_01_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10732 bytes
SHA-256: b1c8ca58c1eea6cf5ee5bfc7235b746f0ded3262859224392cd9ae7db94f144b
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3