Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f11e7cd900e2b…

MALICIOUS

PDF

71.7 KB Created: 2020-12-11 14:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5b9ae30087af66e7a4a0b5c629308a1e SHA-1: 43582ba236f9af6a5a760de0b0570ba0b3786cd2 SHA-256: 687f11e7cd900e2b60c708f37ddb4f1193b7123fd288dc2642370d5747f2468f
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file exhibits characteristics of a phishing or social engineering attack, as indicated by the 'SE_CLICKFIX' heuristic and the presence of numerous external links. The document's content, disguised as a PDF converter, likely serves as a lure to direct users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it may download or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafftec.ru/aws?utm_term=document+pdf+to+jpg+converter PDF link annotation
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/1324320.pdfIn PDF document text
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/a2c30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5fcb75a622adf.pdfIn PDF document text
    • https://tokokurud.weebly.com/uploads/1/3/4/7/134744431/dukamimog.pdfIn PDF document text
    • https://zupusifeduligam.weebly.com/uploads/1/3/4/3/134313264/wakig_tifol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fb82cba0cb3b.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/potiterel-jijizad.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/merekidi.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/1cfb878a31bce.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/pewebopufupe/83633962775.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc14fbda97599144e282881/1606504382347/eso_skyshard_addon_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/3d_blueprint_software_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc135a327a199023ab76298/t/5fc770db7995075abde4e59d/1606906075628/tiwikigofewolukoxeludop.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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 5024 bytes
SHA-256: ec5fd67cdead6c76ef1f8117d93d2603ee41af4f991b713a30a14d6e4a952526
font_01_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10540 bytes
SHA-256: e46daf34b3a5b4fe060d836d520f0f24f1a706d5bcb8db9ce63673b123518fe6
font_02_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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