Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb350d17430567cd…

MALICIOUS

PDF

82.7 KB Created: 2021-02-18 20:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6d7a816944e54070f3a1a750d25c6667 SHA-1: d801fb64f4a777914e5f5539b0720d949fb2a016 SHA-256: bb350d17430567cd99caec1b07d2ed189d5736c91dab0a3c1420a70aef70355c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, including one that appears to be a redirector disguised as a search result for appliance repair, likely intended to trick users into clicking and downloading further malware. No scripts were extracted, but the presence of multiple disposable domains and link farms suggests a phishing or malware distribution 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://druttle.ru/strik?utm_term=why+is+my+ge+washing+machine+not+draining PDF link annotation
    • https://cdn.sqhk.co/kupovite/WVjbjjG/sword_battle_sound_effects_free_download.pdfIn PDF document text
    • http://online-sistem.site/recommendation_letter_template_word_docgzvw1.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/d21f1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/jjijedx/what_causes_stretch_marks_on_legs.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/jazhqAE/83383217370.pdfIn PDF document text
    • http://big-ita.space/interstitial_lung_disease_guideline3e15p.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/gf7ggnv/game_of_thrones_warlords.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/gR5ggjj/fudarenojusizexija.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/dxifigv/vefuwejak.pdfIn PDF document text
    • http://sks-expertiza.ru/35084265438dymog.pdfIn PDF document text
    • http://nout-prodat.site/download_field_defender_mod_apkbm1ev.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/iijPuhe/polly_pocket_pollyville_super_slide_water_park.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://daboloxasorun.rf.gd/deniniduxofizalutu.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/rokadi.pdfIn PDF document text
    • http://zumepif.rf.gd/ionic_pro_turbo_air_purifier_model_ta_500.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/6261200000.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/73889385497.pdfIn PDF document text
    • http://rudufegasavu.rf.gd/vlc_video_player_app.pdfIn PDF document text
    • http://vodividubo.rf.gd/50095033456.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5316 bytes
SHA-256: 900f614062bba21e6fd5d69a9b4c87f51c5e5d7d09a90cac41d5cf2f02018220
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 11020 bytes
SHA-256: 0afc0ab6fa67e5ef68bc4d4f9e362740498974d71bc07ace641c0b1bb5666392
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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