Malicious PDF — malware analysis report

Static analysis result for SHA-256 38593869c28c80b1…

MALICIOUS

PDF

84.4 KB Created: 2021-03-16 21:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d756ec9d8e5fc683a5ca228ee8db02 SHA-1: 9ce5826d9116b12cb6e2ef6179843c9073aea037 SHA-256: 38593869c28c80b161e171ed1f7fb03ac7a8bda6969c39063bea48a96b74e3c6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, and was flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, suggesting an attempt to generate traffic or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=movement+of+crustal+plates+worksheet+answers
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/xinopawef_tosuf_modexut_lasazol.pdf
    • https://cdn-cms.f-static.net/uploads/4487665/normal_6046b10d79890.pdf
    • https://cdn.sqhk.co/kaxonavi/ifAOe3j/not_driving_car_during_covid.pdf
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/34495799d0ae9.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_60306104cbb49.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_604ce92328624.pdf
    • http://likedizar.medianewsonline.com/75517035939.pdf
    • https://cdn.sqhk.co/rosisole/hkUQT2Z/singapore_pool_online_soccer_betting.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60207bdd7d1f1.pdf
    • https://didefitelov.weebly.com/uploads/1/3/0/8/130874246/lupatozoreluderar.pdf
    • https://cdn.sqhk.co/todusukiraxi/TDchhjd/indy_500_arcade_racing_game_free_download.pdf
    • http://davebamonuzove.medianewsonline.com/ledger_accounts_examples.pdf
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/mavuxone.pdf
    • http://zekaxezixil.medianewsonline.com/antecedentes_historicos_de_la_contabilidad.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/betefetevipixiz.pdf
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/najejixolitub.pdf
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/gizefopukomeg-virulumojur-juzubazup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_830ffa9ffc1e40fe85483603e1c7d381.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_698bb1ef07f945ffbece498444ce9716.pdf?index=true
    • http://tiwatimab.atwebpages.com/ketoxefokixuxofivarirexu.pdf
    • http://juludiripo.myartsonline.com/troy-bilt_21_self-propelled_mower_190cc_electric_start.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3b.bin
cca1b7ff1acbfe0c6905b5049ee315e3feff9986a2ddf68e747808f37cfe2dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 5312 bytes
font_01_sfnt_off0001103e.bin
fd44843ccd57e6204126b4741173279e2ddf80c984f7ae31cf1c657fd39299d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 11176 bytes
font_02_sfnt_off0001363f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 4324 bytes

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