Malicious PDF — malware analysis report

Static analysis result for SHA-256 7114c657b564e769…

MALICIOUS

PDF

78.6 KB Created: 2021-04-02 12:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 892a099f361056b00d5b226c81c4b113 SHA-1: 7cb34308534b0f3b3359c33826c67211b29d59e9 SHA-256: 7114c657b564e76989819c8feb9ca64c3ef881cb8a42f41f0f45755173e9cdf7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/award?keyword=definition+of+social+case+work+pdf PDF link annotation
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/1991599.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/5867920.pdfIn PDF document text
    • http://heretythere.site/what_do_you_understand_by_religious_tolerancervuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_6017b629be84b.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/digixuzowej-susigosajuz-liwoxebiwo-nowakodademosid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_6025595dcad49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_6037627e4bf75.pdfIn PDF document text
    • https://lavigepes.weebly.com/uploads/1/3/4/4/134437347/fifuxeru.pdfIn PDF document text
    • http://onlyforyou.space/how_to_convert_ethane_to_ethanolbcz58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_600bb81cede6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc7542114058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_60601edce1f2d.pdfIn PDF document text
    • http://csxmoney.info/71390984658mddkp.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/926b1.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/mowaxekun-lubiduzifaparu-tegupokitug-bidewarunevokib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_6000c2fd70b66.pdfIn PDF document text
    • http://conicppjry.bid/losirowupolubozng2sw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_606558012cb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_604f0c7966c5f.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/bajuse/xufefagumew.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/clown_killifish_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/45741028092.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 5092 bytes
SHA-256: 0d66d6e829094742a51c7ba8900903b6633f219f37cc22eec16d4de4562aad18
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10848 bytes
SHA-256: ccfa3ef415b08644bb4f9ba8993fcc4fd663a3d10d9bcef34db831eacb3bbcea
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71