Malicious PDF — malware analysis report

Static analysis result for SHA-256 805be73446b78ed9…

MALICIOUS

PDF

81.2 KB Created: 2021-03-30 01:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1b7fcbea69da26021d3656f8edb9f5db SHA-1: b3082d0d15a6ea5358c069bd2f3451338fb4c5db SHA-256: 805be73446b78ed97c610ceab711f4a3f553ca3201d19d78226192f484f8c02f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for malware delivery or credential harvesting.

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/123?utm_term=6th+grade+social+studies+common+core+worksheets PDF link annotation
    • https://gekuxufetog.weebly.com/uploads/1/3/1/3/131384115/82add263b544db.pdfIn PDF document text
    • http://static-start.top/injury_on_duty_report_form6b92i.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/2874943.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/4943942.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/6160489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_60143b28b95e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_605c6e235a8c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_6000925ce7a0c.pdfIn PDF document text
    • http://axecheat5.xyz/angel_care_baby_monitor_ac401_beepingvy0v9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_6051f1e683d0c.pdfIn PDF document text
    • https://zaxonuwikujad.weebly.com/uploads/1/3/0/8/130874627/3236109af3542a7.pdfIn PDF document text
    • http://smcjd.com/jaxopafapedafabivuyrwrv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_6011e55440c36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_605f9858b4689.pdfIn PDF document text
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/9976850.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/bovekuzafemesit.pdfIn PDF document text
    • http://delayikapy.xyz/934654345417fsdq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5feeaaf23e60b.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/215e4aeb-511c-41c8-a2b8-a0afa0b28a3a/bmw_navigator_vi_for_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcef882d-6817-44af-94f6-7f2947fc3a83/what_is_another_word_for_olden_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8f842f-2af5-4a46-a0af-e47caa5922b6/tepuramijivonopobetovuve.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_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 5568 bytes
SHA-256: b6822014cd66e47028517eac2d5db1406ff7c829cea9e3bf37990845faccc80c
font_01_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 10668 bytes
SHA-256: a0e9ac0c7fb5014a0dac46cdb6f38ad6d8a99e9845a38f1308edc3b752d45182