Malicious PDF — malware analysis report

Static analysis result for SHA-256 456a50cf2f09e568…

MALICIOUS

PDF

88.5 KB Created: 2021-01-05 10:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 987d4b67d4747b4e6550c05dc8b74ee5 SHA-1: e8cb2871041801caeae52c64fb8fa13b183ddeaf SHA-256: 456a50cf2f09e5686d86f8542558bf0301c6d89ef99234bc5baa72146e7e5832
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing pages or further malware. The PDF_SEO_LINK_FARM heuristic specifically highlights the mass of external links, suggesting a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=starvation+under+the+orange+trees PDF link annotation
    • https://cdn.sqhk.co/bifugudawesu/ShhQcpG/diamond_shop_ff_murah.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/f537e5d503.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/0vzHWTg/64398752213.pdfIn PDF document text
    • https://gipusarele.weebly.com/uploads/1/3/4/7/134708700/xovukofatavuw.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/mibekiwasale-nofido.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/7fiaxje/21655708867.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/zelikaguneja_xinanon.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/latakusobolugovodu.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/rixeloxeki-tesev-gejagodasila-rulusanoxukiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5fe3dfcea8584.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/jekifovusunutuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/id24hbm/online_marketing_strategy_definition.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/5780534.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/diwileladonosomativo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 5216 bytes
SHA-256: b6f3dd816146c904a38ef2dceb3213c1d4f780ef2699c9e955199233dec98d12
font_01_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10592 bytes
SHA-256: cce44d5781eb487b9d8fd291b576ec32de17c0911d4956603ea61217651b3d3f

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