Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30d6af76582ec06…

MALICIOUS

PDF

86.4 KB Created: 2021-03-24 10:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 39ec2508dcb28d7a3fcc9f4d7f04f97e SHA-1: e1b1d450688186e941b5c4311e85f545e35836e9 SHA-256: a30d6af76582ec065f2c7a8f4d2641eb3291cf376fd6f43b40610c7b7c3ec472
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL (https://xezojetit.ru/strik?utm_term=samsung+520d+48) flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/strik?utm_term=samsung+520d+48 PDF link annotation
    • http://mif-smeh.space/52124310690st88s.pdfIn PDF document text
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/818065bf.pdfIn PDF document text
    • http://kapusta.pro/72844953784rjm8q.pdfIn PDF document text
    • http://moresukko.ru/32913144771bo4w3.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/how_do_i_reset_my_nordictrack_c2200_treadmillf31l3.pdfIn PDF document text
    • http://naturalik.fun/nissan_x_trail_2020_manualqquqg.pdfIn PDF document text
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/5607257.pdfIn PDF document text
    • http://picply.ru/what_two_materials_are_needed_for_cellular_respirationkpwhy.pdfIn PDF document text
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/bigupekelinav.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/c08e8fc3e64.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/811526.pdfIn PDF document text
    • http://ulekschool.online/python_programming_language_wikilk9ws.pdfIn PDF document text
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/dunozidufebe.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/pexuxukajoti.pdfIn PDF document text
    • http://re-prime.ru/romarabijisim9xvrd.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/2353c17.pdfIn PDF document text
    • http://bestsalestoday.xyz/barbie_princess_and_the_pegasus_full6ceeu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/donupolufuwuzozogozudeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a1f1be-6ccd-4254-8ac0-bf5438fc8fd0/34265337436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c0d2dd-564d-4b5a-bca0-1174cd50a43c/how_big_is_a_giant_at_jersey_mikes.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/50012590611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cb78a6-c07e-4b7a-9360-a0642706b144/programming_in_c_notes_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/philosophy_of_mathematics_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0daa6d-a937-4a5b-be1e-ec90952969d7/adidas_santiago_watch_black_and_gold.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 5800 bytes
SHA-256: bcdf964b337ee8e9feecfac65483766b0418019996cf6b19d4dbf148fb0ad33b
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 12312 bytes
SHA-256: bc19a3679a5ce33ddda77e423cbd6b809fa19edb35918163d20959be954e709a
font_02_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e