Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a6f9a09f68593…

MALICIOUS

PDF

88.4 KB Created: 2021-02-28 07:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c4bc5cbb6173a1b10de384ad664339 SHA-1: 184fb4cdd2e0b2e3113e2b490219e30deb56f2a6 SHA-256: a33a6f9a09f685939976a1305a4ba16e8b905b3d6f8294bf76c7901f4a429802
156 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 link farm. The PDF contains a large number of external links, with the primary heuristic pointing to a URL that appears to be part of a malicious SEO or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=domain+and+range+activity+answers
    • http://milanomoda-italy.site/fivisafemanaxinexogumut0dpo3.pdf
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/nekin_purawesi_tilixasamog.pdf
    • https://cdn.sqhk.co/fafojipedul/RQlgdjj/kilasunoxid.pdf
    • http://kismyketio.com/pelicula_mas_alla_de_los_sueC3B1os_completa_en_espaC3B1olgjx3q.pdf
    • http://comforfemj.fun/nujinowisotivakelgtgnv.pdf
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/7a12c4d1b166.pdf
    • https://norenepativen.weebly.com/uploads/1/3/4/3/134315866/lumaronuvaru.pdf
    • https://cdn.sqhk.co/dodanadofu/iOgiaia/anki_vector_robot_review.pdf
    • https://kujazekomoduni.weebly.com/uploads/1/3/5/3/135315250/4439d38552.pdf
    • http://zixudivibudizu.scienceontheweb.net/how_to_identify_my_old_singer_sewing_machine.pdf
    • http://stakingyfi.com/monster_movie_2014_eng_sub7h33e.pdf
    • https://cdn.sqhk.co/kotolodegag/fibhZFZ/car_racing_3d_game_apk_mod.pdf
    • https://xonajababivoxo.weebly.com/uploads/1/3/4/0/134040492/pazaw.pdf
    • https://cdn.sqhk.co/bifugudawesu/gifyjjK/grand_truck_simulator_2_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/xegapanasa/gijfAJ1/withings_move_ecg_release_date.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://parezorizujax.rf.gd/86699846430.pdf
    • http://ranitirunom.myartsonline.com/tecumseh_engines_history.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107bd.bin
c2bb1032716da5c368b0762fe0dfcaf5ce174736976cdb70e3bd36a7729aad9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 5480 bytes
font_01_sfnt_off00011a68.bin
8e269aea8456eae87f6a03d7fc76fadf2359884c64d8d339369524468afc7332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 10580 bytes
font_02_sfnt_off00013e9c.bin
844fb27054059bbe8e24107f7623dfc8b3714af0429cc888d8296577745ef093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 16208 bytes

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