Malicious PDF — malware analysis report

Static analysis result for SHA-256 5379c6bcf71e1e07…

MALICIOUS

PDF

88.8 KB Created: 2021-03-15 11:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbddaeb7918f649f3ca0f08913989387 SHA-1: c3d8ee013440c7596db33f086243f9445b9b2437 SHA-256: 5379c6bcf71e1e07af16443fe13fb1251defebe65202ab3a3912dc71d3ddc4ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a malicious campaign designed to redirect users to potentially harmful content.

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://dugedepap.ru/123?utm_term=open+office+functional+resume+template PDF link annotation
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/dobik-pagizagotove.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/sjfhjgf/toca_kitchen_1_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/Hifgjjg/wigabademusuregerog.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/hemgiz3/30764023033.pdfIn PDF document text
    • https://kesuwevibumeju.weebly.com/uploads/1/3/0/8/130814845/1353981.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/KEhcZhf/jr_kansai_wide_area_pass_japan_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/GgdijTe/zubusemixe.pdfIn PDF document text
    • http://fopuval.22web.org/35432852160.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/7jjLZfq/pafovenuzu.pdfIn PDF document text
    • https://xivetebutago.weebly.com/uploads/1/3/4/7/134737957/a4b1248e55.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/asidosis_dan_alkalosis_metabolik.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hhaQjfN/school_of_dragons_redeem_codes_list_2020.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/nojub.pdfIn PDF document text
    • https://cdn.sqhk.co/gazamara/PYjcl1l/star_wars_live_wallpaper_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/hgDHGgd/solatixigitesopimoxoxaxug.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
    • http://bukarujinadir.epizy.com/a_level_chemistry_practical_notes.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/27423738275.pdfIn PDF document text
    • http://liwiwixorajedik.rf.gd/12883294471.pdfIn PDF document text
    • http://kukosuluwab.rf.gd/2000_yamaha_v_star_1100_owners_manual.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_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 5068 bytes
SHA-256: 8aa8797c3bf0a9ed1058868f9e82537a86f3a2aa1ff699421898f2e963b5bcb3
font_01_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 10724 bytes
SHA-256: 3a512a24ec0ebc2433f6300fe38e75c71fb10a0305bc988262b63b948c964829
font_02_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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