Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fddb230c71549f4…

MALICIOUS

PDF

64.7 KB Created: 2021-02-11 03:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 18ff92ce3c4f31fcab6e894ccb792bc7 SHA-1: 8dbb74b84049f75a9074fe427587ee8522b479cd SHA-256: 5fddb230c71549f471cac681b4bbb533d4e0cc8dda4b3615fd2a4bad7bc59adf
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=hunt+high+school+phone+number In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe2bd15869ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe9ec7e5915d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fd7b469d78ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5fe02d3067273.pdfIn PDF document text
    • https://zirorimasarikar.weebly.com/uploads/1/3/4/1/134108573/buvolaseviwiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/djdiVBq/ballout_lyrics_robb_banks.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/HAxgeiB/kogejusaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419204/normal_6005b5274b997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_600f9e24b589d.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/nedijowewoded/angular_5_formcontrol_seterrors.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/gipavajafokazugufurajuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/linear_programming_profit_maximization_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/mapsource_6._16_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/7306979205.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/human_warlock_wow_classic_leveling_guide.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 5236 bytes
SHA-256: 4b36b91c66252a24b4dfe17a3b0d3f345c5571a87d52cb3a89c2bb1a8b1bc998
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 10952 bytes
SHA-256: d6fb8aefb183e9aff6169dd233a157ef5a524d308542d4a8f6a972047226dc36

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