Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f85ab908e3cb89…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 15:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bcf10b839dc747ae228f461905228463 SHA-1: 8cfe9cf61f27c6418f9023e6f0bc69fed901eef1 SHA-256: f2f85ab908e3cb89171add4dcded8faaf424e49c700da27e62b8a369fbdff99e
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 0.9997

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://xezojetit.ru/123?utm_term=shoulder+dystocia+also+guidelines PDF link annotation
    • http://ideal-it.fun/1021991160pcypj.pdfIn PDF document text
    • http://biolinkus.me/72749029522lc8ri.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/86689908313.pdfIn PDF document text
    • http://labiosdewonda.com/irony_in_romeo_and_juliet_act_1_scene_1q514k.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/tT0KUhg/muwofutagupokipikiserel.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/what_were_the_4_main_points_of_the_missouri_compromise.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/seresudupiwupupazusosuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jfjdjdj/overkill_3_game_download_uptodown.pdfIn PDF document text
    • http://fruit-italy.space/nilozepmbrsc.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/0Pjsn0L/sikewazaxa.pdfIn PDF document text
    • http://discout.online/jetech_2.4g_wireless_keyboard_manual1ewcg.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/vakukotasasisoseramig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_75dde2b741f040f7b74cd0d4617ef2ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/c._difficile_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/6143391763.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_7785743e7ea748049112dfa33045c79a.pdf?index=trueIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_4d854d2242234de3b4533497f6fb9e56.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_4fcfb04042af4dfdbcbaf2210dbfbac7.pdf?index=trueIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_3f154157044940358460a9586c71f4a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fibesezati/aranda_primary_school_uniform_shop.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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 5404 bytes
SHA-256: b0166fee839953615b872c08e3ba2da205cd072172ece9e67315a4df49cc4ac1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10560 bytes
SHA-256: fcb88a30abbcc5896863c7f86078dd2284919e0bcc0290b2c9333cab298a3890

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