Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c6b5c114bd6233…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 16:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 50dab090085a7bbcc74357dfa82b7726 SHA-1: d2df20f10719df068ee1ef667da535c6da46bace SHA-256: d5c6b5c114bd6233c769926893796e13796a35695b1214fcd74247e4f94bce4e
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=systematics+and+the+origin+of+species+pdf PDF link annotation
    • http://centerbluebadge.com/starlight_cinemas_costa_mesa_movie_timesflbsy.pdfIn PDF document text
    • http://clubstore.info/wepumowamiwn6e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/De4gigh/game_robbery_bob_mod_apk_apkpure.pdfIn PDF document text
    • http://ogranifruit.space/arsenic_contamination_in_west_bengalhbsrh.pdfIn PDF document text
    • http://spain50off.info/fetewewomubatobujejewnb.pdfIn PDF document text
    • http://meetchat.space/wesofomikokij502vp.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/7gcjajf/zimozawezuza.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/zibhcjf/zifajanidedawikepija.pdfIn PDF document text
    • http://ersoil.fun/electronic_music_technology_definitiongdy7x.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/jeGiuZm/you_break_the_glass_ceiling_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/YhhbVOc/my_talking_tom_angela_games_video.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/hdgimHi/36934178847.pdfIn PDF document text
    • http://sberpodarok2020.online/vizio_m55-c2_power_board0l40c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakatidewejuna.epizy.com/93445866109.pdfIn PDF document text
    • http://zixupav.rf.gd/91961519211.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/86459566164.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/maplestory_reboot_starter_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/what_spine_arrow_do_i_need_for_recurve.pdfIn PDF document text
    • http://zururoda.epizy.com/47347295925.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/31877640057.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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 5740 bytes
SHA-256: 1c9adfacf453ed1f024c7ca09ab0c9e800780f8b5d8680eb05d80806c73658fa
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 11524 bytes
SHA-256: 69b0b8b8ca1c309a484666d5af5af4b2d7bb3d43a17fd15c996818ce55297be9

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