Malicious PDF — malware analysis report

Static analysis result for SHA-256 735da205bc73b6f4…

MALICIOUS

PDF

68.5 KB Created: 2021-03-17 06:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 25f47ecbc6011b55328cd34d24f615f4 SHA-1: de6ac18db1a4b31894d294e996a4ab3929b681fe SHA-256: 735da205bc73b6f440a505f97e96d6f9631bbc4bc0a87d2371bacdc49a065737
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=north+carolina+unpacked+standards+8th+grade+math PDF link annotation
    • http://sadipize.scienceontheweb.net/nuwojipulole.pdfIn PDF document text
    • http://belkwigs.com/and_summer_is_gone_short_story8epqn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_600cf44e41917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_60496f9a87918.pdfIn PDF document text
    • http://dihtyar.online/how_do_you_test_a_hayward_salt_cell0barx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fcaf6e81261f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca892cc96ed.pdfIn PDF document text
    • http://kudretbozaci.com/65734227353oe6ne.pdfIn PDF document text
    • http://wordwild-store.com/difference_entre_iso_ts_16949_et_iatf_16949git6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5fff281b43367.pdfIn PDF document text
    • http://mjawebdesign.net/how_to_calculate_face_velocity_of_fume_hoodt5iyi.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/ea6a0aa0619c5be.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/bexix.pdfIn PDF document text
    • https://gabijuwi.weebly.com/uploads/1/3/1/8/131871583/gopuwib.pdfIn PDF document text
    • http://genoray.pro/coreldraw_shortcuts_free_download0mi2x.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/kavewujuo9m6j.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/fowonaxul/dojegu.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/rijipidilub.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/wing_chun_close_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/zawuwifosukibujagazob.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_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 5716 bytes
SHA-256: 83912bb9a23f923635b336db23f0cca2466f115f15f29d4c16fe8572c6c11d7d
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 10888 bytes
SHA-256: 3983766e27f3b6ecf1131ca622d2425aa586494d571bf6834c80ca84fae8ad64

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