Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f390a3e7c143a23…

MALICIOUS

PDF

79.3 KB Created: 2021-05-15 17:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3539e698c509f6cc026ef6e29888e230 SHA-1: 031069e21caea856d6a4833bf4b541023743daf2 SHA-256: 6f390a3e7c143a23dd53e73743b44786e47c17497afb3ad73623f6d63eb68789
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a strategy guide, likely to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=pokemon+red+blue+yellow+strategy+guide+pdf PDF link annotation
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/digoxetazolam-lidakikagapi-bawejezakuvon.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/f285498e3.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/jejihhQ/riwojudowufofarugosixum.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/ad8df5099b0630.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/8557075.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/fumunugebes_basiwosixoniwop.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/f9aa987ad777.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/94485.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/eat_your_frog_brian_tracy.pdfIn PDF document text
    • https://cdn.sqhk.co/ranofakon/hfz5ifl/cambridge_checkpoint_mathematics_coursebook_7_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/eRVGjhJ/teacher_appreciation_gifts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/47bidia/the_roommate_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/j3ifeKT/lalekilegasis.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/MhfaUhh/fapiwuzokuxafinidesovuzaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/dtFiiRN/drag_extreme_racing_3d.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/37120874736.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/XjiyUeD/86074378248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biborufa.epizy.com/aged_care_assessment_program_guidelines.pdfIn PDF document text
    • http://nekaxikafixof.epizy.com/download_blue_is_the_warmest_colour_on_netflix.pdfIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_f907b1d0da47424b92749a8ba1c8dc15.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_437370d088444d4db654ff9c9f8c6bc0.pdf?index=trueIn PDF document text
    • http://vudajerex.rf.gd/77507771044.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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 5760 bytes
SHA-256: 51b31e7fa40df882f55077942fb2f3e435cba2495d261058df9015dcf9c73f40
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 10536 bytes
SHA-256: 0b22048656b6a81b7c6aef9d8411fbd6f3aba8792fb1f5822bd92ab59bb88c46