Malicious PDF — malware analysis report

Static analysis result for SHA-256 3accd290a9bf81bf…

MALICIOUS

PDF

74.8 KB Created: 2020-12-26 12:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 36667278d6f1d2380e2eadd0e6bd5a1f SHA-1: 4a6af4294ba33c78b2728072bf5bf76e8281d00c SHA-256: 3accd290a9bf81bf3bae2a5a27f1a05b61976f142a90170fbf8bc6dcf266cd24
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are likely part of a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/strik?utm_term=baby+panda+first+word+apk PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/tiruvokanozi.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/rozumevepov-nodiselitobuvat.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/HicagdW/65726292158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_5fc278a19852e.pdfIn PDF document text
    • https://merigufut.weebly.com/uploads/1/3/4/3/134357701/00e95ec.pdfIn PDF document text
    • https://vosokujegenukof.weebly.com/uploads/1/3/4/4/134474729/zaguge_sawewujoza_vuxivovidarenir_savoluzok.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/2ijv9hc/talking_ben_the_dog_game_online.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://s3.amazonaws.com/xafaxotaful/kulirefonasawiroluvuteji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ba288e-0e3d-4c44-8212-216cb5aa26c4/rockfish_hoke_elementary_school_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1b4ef3-ab27-46cd-b8ca-024c1744541a/86888076550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0d289c-dc51-463d-9621-69f52f3d0c46/pixob.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 5120 bytes
SHA-256: 06851b667655b3be889eac4f27577fc651ec569b59403d35de280a970b59b92d
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 11680 bytes
SHA-256: 74c3f272191176afb02225a357e9fbba15cc332a390a7364afc877fb02afcb8a
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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