Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faa8a208832d1d9…

MALICIOUS

PDF

70.8 KB Created: 2020-12-05 21:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 43b1642533879975737c7dcde5a7b5f7 SHA-1: 1b039da176383a110593a1dbf1a91beb548ae737 SHA-256: 6faa8a208832d1d964c079fb0dd9bc71c70d4124c05bc8a903f7779b6cd90d09
186 Risk Score

Malware Insights

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

This PDF document, identified as malicious by ClamAV and an ML classifier, contains a large number of external links, many pointing to disposable domains. The primary URL, 'https://traffnew.ru/123?utm_term=d+is+for+dinosaur+worksheet', suggests a lure to a potentially malicious site. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a tactic to generate traffic or distribute malware through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=d+is+for+dinosaur+worksheet PDF link annotation
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/tamozajanoxiki.pdfIn PDF document text
    • https://pivubetipu.weebly.com/uploads/1/3/4/3/134328131/ca8e4.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/7797523.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/bobezumuso.pdfIn PDF document text
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/lerifu-vevagetekasiw-xemirajemenib.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/1062954.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/diledik_luvegeleve_jetutis_lulefoxetapaneg.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/sigobija/hyphens_worksheet_year_6.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29c05a3bf4b14abb4035c/t/5fc871277ff5a343ebf5b5d3/1606971691317/pocket_watch_tattoo_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478c6c75-3be6-4582-8a41-4d8562e93246/algoritmo_cubo_rubik_3x3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc787120d716e027b048861/t/5fcb1a1eda45e86cca9dea33/1607146014484/lightsaber_forms_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48d6b58-ad17-45fa-91b0-e633a4726826/rwby_ruby_and_summer_lemon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1138816f6d44b07bfcb5c/t/5fc923fdbdf2bb7df9e95956/1607017469608/stick_fight_the_game_ps4_kopen.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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 5120 bytes
SHA-256: 416f16d114e336b73dbaa5bbe0af55f3d2fa26c1aa5a3b940abb7b4df2bb5e2b
font_01_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11332 bytes
SHA-256: 267e0a2be6a71700cfc79aa4aea2b4e2efe7f9867c8002cdcfe30454be1a5691

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