Malicious PDF — malware analysis report

Static analysis result for SHA-256 933efcbabceca175…

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 16:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a4575a37d22180300e8d8e1c606f2b07 SHA-1: 2e17a4aab4fb85ad02afce978e62dd142b977e2d SHA-256: 933efcbabceca175c0b601589bf73239e1826af18c2ba333fa56a4a282e724f5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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=intermediate+piano+sheet+music+free PDF link annotation
    • https://cdn.sqhk.co/xufatirumina/fMcIhjj/kovunafexififumukizife.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/beruwu-vamosat.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/eXhjghU/u10_soccer_kickoff_plays.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/faxixit_jifeme_tenaruxal_degaxesi.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/wojemifapi.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/fUjhgjd/mepiserixige.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/wd_my_cloud_ex2_manual.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/tajilatekuligeku.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/38077701029.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/jbcc_nominated_subcontractor_agreement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15125534-17fe-45ea-9840-da3a60b1b0bd/what_does_the_yellow_circle_with_a_star_mean_on_snapchat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eea7e96-b008-493f-9695-7e9202c14b4a/how_to_hard_boil_eggs_in_a_pressure_cooker_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5178c79-6dff-4d72-8268-99dd884bd5c4/hbs-800_bluetooth_wireless_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bdea03-2cbb-4168-9cb8-4ee14f9cbf3c/how_do_you_describe_a_harvest_moon_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3548a8-2df1-477c-ae70-6f214adb2efe/would_you_rather_naughty_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d1c7e0-0b72-483b-8c8f-660670da8658/verb_tenses_spanish_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201570af-b589-4c81-9d7d-9a4bd713dc5c/39310099840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5049e101-4f66-4f75-a717-8c6a991cc3ea/how_to_connect_xfinity_dvr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45920e95-eb68-4842-bd66-a37fc3fe262f/bible_character_who_waited_on_the_lord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d626e28d-c139-46ff-b6aa-01b9a39841c5/sizigisav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a2335c-77cd-405f-9993-26c589e1f511/zojegudejinafoxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a899ff2b-4db6-460b-bf45-d1662d5c0916/kebafubijiwunawoworefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383a8a70-e23d-4497-b2aa-25b4b229a003/how_to_factory_reset_kindle_fire_7_when_locked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f292dd76-38a3-4b72-8388-f1c0f8629749/how_does_the_cornstarch_and_water_experiment_work.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5300 bytes
SHA-256: b7476cf99a71219353078dda523a19839ed9f1f9b56d32536b0783020731350a
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 10424 bytes
SHA-256: 4dd2f892b2df447f024422b7226c9c6c6da833e36cf86a0778881562a6560efe