Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fb048a3ed7a157…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 21:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbb122025d47d5d6721c9d6409726293 SHA-1: a927a3d19b6a31e2f8e98876d6f152dbb264fb5d SHA-256: d2fb048a3ed7a15712f69c845ec4eaa49a871b1fbd68ee33bb5e23c0c7a1921a
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, including a redirector URL, suggesting an attempt to direct users to malicious content under the guise of a free PDF download. The presence of embedded links and the overall structure point towards a phishing campaign designed to exploit users seeking information.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/123?utm_term=alias+grace+pdf+completo+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fde3e2b2e699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_602958392f488.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/ui8ibSr/36111630781.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/fgjhuic/66097412954.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/1wry36n/clean_classic_cars_of_sarasota_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jjhiaRp/lugoluzemedivito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fe2b92c1abaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_602eb0ecdfa49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fee70826c891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12310b0b-e490-4358-b92e-3eeab76bc1b9/xodaduguxutofivixesi.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/4589534646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad59aa57-d138-493b-98dc-396fd00c5646/how_to_reduce_high_blood_pressure_naturally_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68748b60-cab1-4c6c-adef-d1300f514ac5/lilowofumenexexajitomaxu.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_069cb25024474cccbbd498a18c5b8f83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/kuboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1df586-2ff1-4171-a6fe-bdd7c0351466/85431349200.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_c613eed5f5324e17a076da0b904b80f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/lufiginogelatiramebuzadi.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/fraction_worksheets_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d421076-d21e-4cd7-9afe-c1ffaec0b5a6/99897918025.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/muvot.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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 5464 bytes
SHA-256: 02a424ac9757b8cda0f4d89c9b07b283b586a2ef6831f26f2ed32e20f0fe9916
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10836 bytes
SHA-256: 13d05381727d62739c6f595deefacc9cb53f8287ebc4ae01529f68d536dfa8d5