Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7c00f4797b85a2…

MALICIOUS

PDF

89.5 KB Created: 2021-04-06 09:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe7358438ab383c23caa796ab840e2f2 SHA-1: 731bea5634fa173e8d7b1e19a441859c63e0ef04 SHA-256: 3c7c00f4797b85a262d092db8d7397b1e74ccb4964afce63bbf201d57014d869
126 Risk Score

Malware Insights

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

The PDF document contains obfuscated text and multiple embedded URLs, indicating a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown reputation URLs suggest the document is part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for credential harvesting or malware distribution.

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://jacksth.ru/strik?utm_term=how+to+connect+a+zagg+wireless+keyboard+to+an+ipad PDF link annotation
    • http://ogranifruit.space/56215801753i1c0r.pdfIn PDF document text
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/4906577.pdfIn PDF document text
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/wukugolepexiron-wajaji-tudexiro-lefuba.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/7265028.pdfIn PDF document text
    • https://tasuvoni.weebly.com/uploads/1/3/4/6/134690764/rowojonoxon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_603c64c08a394.pdfIn PDF document text
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/3261363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_60554e9aa6808.pdfIn PDF document text
    • http://smartycredit.info/the_shining_twins_scene_analysis4oc18.pdfIn PDF document text
    • http://cheapkeys.site/856034497840ipf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_600290dbac897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5ff760947d8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_603ce9920eef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fde9f5bae1bb.pdfIn PDF document text
    • http://labiosdewonda.com/14145532029iuoob.pdfIn PDF document text
    • http://gnatural.space/legends_never_die_piano_sheet_music_easy4sf4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_60353350a4baf.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
    • https://s3.amazonaws.com/mexavofezoxi/rlc_circuit_lab_report_conclusion.pdfIn PDF document text
    • http://zufelagek.rf.gd/80254746237.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/sofaxatirefurawejawav.pdfIn PDF document text
    • http://xofaxisenulomav.epizy.com/91356347025.pdfIn PDF document text
    • http://fagemefixuf.rf.gd/sherlock_holmes_1_full_movie_download_in_hindi_hd.pdfIn PDF document text
    • http://sosukaf.epizy.com/nalugesewiwikefepiz.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/asenath_mason_espaol.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_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 5436 bytes
SHA-256: 35656ad16f68c6ff923dcf51d2ada0752e7df458c29725cb942748b79620220c
font_01_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 11456 bytes
SHA-256: 69cd42b8632e49246e5c1ec6bb55995f67f4bcabe69bc5bf2ba05727a3835863
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176