Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06f3b4b1f356ffc…

MALICIOUS

PDF

94.1 KB Created: 2021-03-01 17:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9d2dbcae8a0fcb75908d6571cc931490 SHA-1: 7678c0f79e94b4d8e112d9f87da9aa2f68cc85c5 SHA-256: f06f3b4b1f356ffc949ad6d55af4b33619259b4794bb7c21d0192f45b3751e2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One prominent URL, 'https://zajinet.ru/wix?keyword=control-m+concepts+guide+pdf', suggests a keyword-based lure. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=control-m+concepts+guide+pdf PDF link annotation
    • http://manaxupupili.iblogger.org/american_red_cross_volunteer_connection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_60359877d207c.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/db810c79e9f2616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fcdc5910a11f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5ffe8fdc7abec.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/zerepuzuze/43814779684.pdfIn PDF document text
    • http://rusozetowozo.epizy.com/77503158781.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/legijumapufukusu.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/giliwudiropiximibapa.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/62607857456.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/private_video_from_facebook_to_iphone.pdfIn PDF document text
    • http://lamiredej.epizy.com/fetawanuwadutat.pdfIn PDF document text
    • http://watijosanowo.epizy.com/armored_core_last_raven_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/attack_on_titan_season_4_release_date_netflix_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/43627699051.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/instax_mini_8_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/25020505624.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/77722647339.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_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 5200 bytes
SHA-256: e723abb65e43bb622fb7c06e152dc90072a93c0a984a8d3e35e1bf1b231b3003
font_01_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 10656 bytes
SHA-256: ce6e92d8e7ceb8e4862aba2af1b7fe07cb0dee03f6e3379704697da85de0b0d4
font_02_sfnt_off00015cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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