Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd75cdb7088fa52…

MALICIOUS

PDF

67.5 KB Created: 2021-03-24 22:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dc428f7cd07d6868639bdbe7ffac8202 SHA-1: 550d2ed364ada9fab25cbec9546ba6b31db1030a SHA-256: 7dd75cdb7088fa52691a155ad479d679bfaaae1919fdddbd9c25b0e2d0704394
126 Risk Score

Malware Insights

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

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 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 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://crophysi.ru/123?utm_term=channel+banner+template+no+text PDF link annotation
    • http://nnorm-id.com/peugeot_103_sport_prix_tunisie_2020uckmu.pdfIn PDF document text
    • http://sodaapp.pro/yu_gi_oh_duel_links_dark_magician_of_chaos_deckiasai.pdfIn PDF document text
    • http://matras-24.ru/2005_nissan_frontier_transmission_problemsa9ny2.pdfIn PDF document text
    • http://nuveclovet.xyz/google_sheets_slicerwhezw.pdfIn PDF document text
    • http://xviiivbgz.com/27331634443ycg12.pdfIn PDF document text
    • http://tuimag.ru/tatutesepi6ki.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/how_to_train_your_dragon_homecoming_season_1_episode_21nmiw.pdfIn PDF document text
    • http://goldalbum.ru/29305753777ccjxg.pdfIn PDF document text
    • http://prechambre.xyz/xelejikom5cuny.pdfIn PDF document text
    • http://legrand-spb.ru/129894146693w78u.pdfIn PDF document text
    • http://matteset-spon.space/tsa_carry_on_size_jetblue2imjh.pdfIn PDF document text
    • http://spacexfoundation.net/gulogeparutajevhsb7f.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/kugelilizibuwum/how_to_get_certified_iso_27001.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_9980aa0c3e37441694ad0870660b4f36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/english_bible_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/zalodumoba.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_3f470772d22f4ef89cce2196d4fa4f8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/werewolf_transformation_full_moon.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_27d145b1645944f7bd76e28cb341524a.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_649aa3f991e640edb4dd2783b3be07fd.pdf?index=trueIn 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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 4992 bytes
SHA-256: a092206e8c4fb796a7f4a4553ee7ece2865e5f5f67e30058ab69850136d59416
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 10236 bytes
SHA-256: 2a6e94a9df57615b277c706ce084349895b882750447cfee726f9df753c63f85

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