Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d06a129d04a6c7…

MALICIOUS

PDF

92.3 KB Created: 2021-02-26 02:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5a6ca521e27d190fe4c1d51073a3150d SHA-1: 5be370a708db230f4253405517d765aa645a21cb SHA-256: c6d06a129d04a6c7474291bce648f3e99a6ab50d5a645b429f07568bf231093f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL that appears to be part of a link farm designed to redirect users. The presence of multiple disposable hosts and UTM parameters suggests a phishing or spam campaign. No scripts were extracted, but the PDF structure itself is leveraged to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=surat+juz+amma+bahasa+indonesia PDF link annotation
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/baxumoredegujijinoba.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/ggIibhj/short_stories_in_english_with_moral_and_pictures.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/8327580.pdfIn PDF document text
    • http://mufawajidoxe.22web.org/aparajita_tumi_movie_songs.pdfIn PDF document text
    • http://artrosil.xyz/wordscapes_answers_level_1083i3wxy.pdfIn PDF document text
    • http://mirror-x.org/jlab_jbuds_pro_wireless_earbuds_pairing07qfx.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/662600110fbfea7.pdfIn PDF document text
    • http://secureappeal.com/4th_grade_timed_multiplication_worksheets4k0ld.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/dto8tjf/20314926372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/the_fall_of_the_house_of_usher.pdfIn PDF document text
    • http://kedokonox.rf.gd/facebook_gaming_free.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/migare.pdfIn PDF document text
    • http://xomufulikade.epizy.com/annalen_der_physik.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001376b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1376B 23900 bytes
SHA-256: c2ec9abe6980d5a00bb62d56b46fa16521d33d1bece123bf4ecee09b7ed555aa
font_00_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 3104 bytes
SHA-256: 7935a9011d1ddf925e4c615f0d4c7ebc5c36e944a8283dfae3a9b58fd21d210d
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 5400 bytes
SHA-256: d050cc01d91bdc2d27c9a12356695c66bab822532255bbb35462a4f61f83804a
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 11196 bytes
SHA-256: 65195d6ee98ea019b0618af4746202df9af0c2dd991dc192f57c836d20122f2c

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