Malicious PDF — malware analysis report

Static analysis result for SHA-256 9433970d5c4ac7ba…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 22:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1192f2026cbad197f04f402aae5dc9b0 SHA-1: ebe0aadaaed690a9703512126afbb3b5a3376618 SHA-256: 9433970d5c4ac7ba2911cb0f6c1c20beab61c96cd892afe3442bc8a89fc491f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the classification as Pdf.Phishing.Trojan strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=bolt+head+types+pdf PDF link annotation
    • http://robugipunebib.mygamesonline.org/patab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_60126d1c6ad0f.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/ig1gcgj/jilotaxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/BPpgchf/16486920754.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/9_principles_of_effective_communication.pdfIn PDF document text
    • https://cdn.sqhk.co/silagigud/5hasS0F/formal_belated_birthday_wishes_for_boss.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/electrical_design_engineer_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jizejotuwoz/nT83zje/kick_fruity_loops_download_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/Nfgghhd/eve_morphite_mining.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/hejhidR/melofinub.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/wagolowofovulivonuguvoviw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_6053e141dbac2.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/iigciiI/chores_in_this_house_cardi_b.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/kavozojijigivudi.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/jhz6kg7/cheat_lightning_fighter_2_mod_apk.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/boarding_pass_lion_air.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/hXrjfib/to_mars_and_beyond_song_list.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/marla_maples_age.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_6004429f905e0.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hjRkDig/savorugomozedi.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/xgg6Ohj/sad_anime_boy_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ih2GZjf/68381976255.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/cds_2_2020_answer_key_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 5184 bytes
SHA-256: 86896d1c318ae37399496a041744b4e6c6c803313995bd086dac5ee99f5cfbcf
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10112 bytes
SHA-256: 106ed785bc3f19601c5585086eb58b3dab75d9a681b671f72c0c4fef2dfc3108

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