Malicious PDF — malware analysis report

Static analysis result for SHA-256 532b32cb920d8a88…

MALICIOUS

PDF

74.8 KB Created: 2021-04-18 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70fb568df9a2014b4fd40cba1d151a35 SHA-1: 29aa959e5155c94661d6670bf469a156d506505d SHA-256: 532b32cb920d8a88c845516234883d911432fbbce9a59d100a6e1b73da2eb65d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://xajibur.ru/strik?utm_term=how+to+find+out+how+much+a+grandfather+clock+is+worth PDF link annotation
    • http://loziwazekon.medianewsonline.com/bilingual_method_of_teaching_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379612/normal_5ff281f59f7bb.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/maxi_cosi_pria_70_front_facing_installation.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/nefezovigis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5ff59fa5643cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_85b127e30fad44a38e4fec6356d647b7.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_6ee3d1900184421cb1570dde7e7b084a.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_37cba648224f44afac61be96e7129d2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1735a49c-a65c-4194-8c6d-ec20e8d530d4/can_you_play_microsoft_flight_simulator_on_a_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a466f1e1-ae94-4db6-a28e-cc8addd60760/xepizenibasunodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac04676e-3fad-4f25-b188-67013b227b4f/is_comparative_research_qualitative_or_quantitative.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/is_the_movie_the_book_thief_a_true_story.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_3c35000345f748e8b58dcb9169783f19.pdf?index=trueIn PDF document text
    • https://70a023e4-b173-4b34-8ac5-854d526a16b0.filesusr.com/ugd/5aec30_e821eea92b954195abbdfcb074a0636b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d0a1d2-a04a-4382-85c6-bb0094c66e1b/zidudumalav.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5552 bytes
SHA-256: 2ace31439cc90036db20ef3c7b75f3c8a8e2a1a5d6aa29160a73c89372fac4c9
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 11312 bytes
SHA-256: e0f3c8c44ce3b4c59b000a402daa3548c45bc88268cda8cd94c37b3cf50676ad

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