Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6916ea54c70b062…

MALICIOUS

PDF

83.2 KB Created: 2021-02-06 19:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 005bf53b804aaf4c3a91aa1a85c1badd SHA-1: e63c39d84a39318a79af94442d019c816037cc50 SHA-256: f6916ea54c70b06259eed4a8231cd8433354077a4b723f562d3cff92d616e216
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 services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://seumenha.ru/aws?utm_term=mp4+video+er+software+for+pc PDF link annotation
    • https://cdn.sqhk.co/poronujefino/xgeTNif/gemad.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Eydicgh/wumibumitabaz.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/4410300.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/jbTiaPe/jadaloteb.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/ihnetgi/woodcutting_3d_simulator_game.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/kaxun_mudexo_morimuxuxowofi_zinam.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/okiaxyU/sky_fighters_3d_mod_apk_unlimited.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5feb483318955.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/3805429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ffb4df363e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fd5efe3c17d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc8709f5bf93.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/nudasuwofelaxegi.pdfIn PDF document text
    • https://buxapuwale.weebly.com/uploads/1/3/2/8/132815799/839f8.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/2103507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/a_l_agneau_de_dieu_partition.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/editing_pages.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_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 5364 bytes
SHA-256: b54ea9e30c96d05fc79e8ab463255963c80ae9173c31ed6f859e06a7d6deaafb
font_01_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 11056 bytes
SHA-256: 42f330fc93b1f157a0a3dbd176619e9792a064ab561a5c933608100abc07aa80

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