Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cc4f3897c354ba…

MALICIOUS

PDF

99.3 KB Created: 2021-02-28 01:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 312bc8028fe681cb226e692cff1a5af6 SHA-1: cc9793090fa0f94dab013a298f754050d3e16c47 SHA-256: 57cc4f3897c354ba3d15e16b19ac9008639c697e654695262907f49d8b065b99
206 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF files hosted on numerous disposable domains. This behavior is indicative of SEO poisoning or a phishing campaign aiming to drive traffic to malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xajibur.ru/123?utm_term=scorch+trials+book+quotes PDF link annotation
    • http://blockingscenery.com/92039437031af26y.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/I6sgcjg/wedal.pdfIn PDF document text
    • http://trysol.xyz/48456331159vqvjt.pdfIn PDF document text
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/a9a56ea9d5.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/hih74cv/poutine_and_cream_secret_menu.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/bivexu_favibelotorivud.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/xugeduzases.pdfIn PDF document text
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/844ea0c25c8.pdfIn PDF document text
    • http://sokolov.fun/scratch_game_tutorial_advanced5hzch.pdfIn PDF document text
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/gakefarekozogiwel.pdfIn PDF document text
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/0a7897dee.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/sQjhewX/44574884150.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/idqjekn/sniper_shooter_3d_new_free_shooting_games_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/JFzhfih/deniwawubuvewa.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/Mjh2dig/final_fantasy_16_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/iaGSGbs/charm_city_kings_full_movie_watch_free.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/tomurowivit-zeboj-refata.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/wovugi/koneru_ranga_rao_report.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_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 5320 bytes
SHA-256: 8f95dec2d2e484d4e7cf19ab0217b10ff3483b9139ddec477c74c210941ce584
font_01_sfnt_off000159fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 11584 bytes
SHA-256: b9f2861ec601ce88112662f1bc60c9b4ce524924364ce7318f47c59345b76457

Open this report in the interactive analyzer, or submit your own file for analysis.