Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a1dcc09e1e7fcf…

MALICIOUS

PDF

67.8 KB Created: 2020-12-20 03:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2fea4c4b9a591df4c215a276ba7ed12b SHA-1: e6489ffa1e0d1b130e068e5fe822523c11a37d99 SHA-256: 48a1dcc09e1e7fcfbac5c456b2b0ba9c3b82a37835ef20515644e76c2f986853
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://trafffi.ru/strik?utm_term=water+polo+dryland+exercises', is likely used to direct users to a malicious site. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffi.ru/strik?utm_term=water+polo+dryland+exercises PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fcfb2cd28811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fae13632bd32.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/eeff279779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f9256ea94340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f8a69a0b44c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fbf25b1712f2.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/fomudebipefasu/3_grade_math_worksheets_multiplication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3245e8-7d8e-45c3-922b-5b932649c910/sexual_reproduction_in_plants_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0775c873-34e4-42d5-baee-a4c85059e227/kisifabimexatapidikamixat.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/tupixivivav.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/dimejefuvoxinunun.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/fokur.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5248 bytes
SHA-256: 0a3b6c05ffdb21b08420b000403a28e4f057b55c1d037465ac042a21e1e5b2fb
font_01_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 10476 bytes
SHA-256: abc5d3ea5aac83b0d31f2903b901c4c23222eb17cfbcd2da9836ebac848dd526

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