Malicious PDF — malware analysis report

Static analysis result for SHA-256 56907e2d226b184e…

MALICIOUS

PDF

83.3 KB Created: 2021-04-11 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6ed692da8d93309917ceaa41b31afe3d SHA-1: fac5d9b9d2cbaf1e570000df984f78bb2fc065eb SHA-256: 56907e2d226b184e98402e0cfde325673b80f8b72b22d13673f258b8bad838ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malware distribution scheme. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=what+was+the+march+of+the+flag+answers PDF link annotation
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/suwejosozovam.pdfIn PDF document text
    • http://orehi-siberian-force.online/46329095942sblra.pdfIn PDF document text
    • http://relax35.ru/4043077448ft7fc.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/252629c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366357/normal_5ffb87eb0a029.pdfIn PDF document text
    • http://bridgecommerce.com/19262697561w1kdz.pdfIn PDF document text
    • http://eurosett.net/first_aid_usmle_step_1_2020473ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_5fda0788c2cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_6028eb8266599.pdfIn PDF document text
    • https://kokuxokuge.weebly.com/uploads/1/3/4/7/134771281/vedotekiguz_fapewafikalijif_kanoludebaba_paligasam.pdfIn PDF document text
    • http://govnosiakxws.online/braun_thermoscan_ear_thermometer_manualzg43m.pdfIn PDF document text
    • http://wide-do.top/ejercicios_de_trigonometria_aplicados_a_la_vida_cotidiananokly.pdfIn PDF document text
    • http://ketousa.site/apology_plato_audior6dyv.pdfIn PDF document text
    • http://bnl-jobs.com/15515386202ixo4u.pdfIn PDF document text
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/wanutexap_mijabozaj_lazizuba.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/tuvidesok.pdfIn PDF document text
    • http://fbdirect.site/60318091204e7tlf.pdfIn PDF document text
    • http://about-central.com/esoteric_life_meaning_in_urduxku6d.pdfIn PDF document text
    • http://good-production17.site/31648560982z5kh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5fdc3675f2b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_606bd71f6837b.pdfIn PDF document text
    • http://galoomer.online/achcha_lagta_hai_songak56l.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
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_6f68993af8fa4aa58b5dc0a8cfccec20.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_46d79f4f41624706b88be68e2e8617b8.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_f5c2663d84f64248bdfdb9f8bbfd6b91.pdf?index=trueIn 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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 5140 bytes
SHA-256: 4bbf05f4a538b058738a0403429b0cbdfd6c42dff0073b3a69f7bf597107b4ff
font_01_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 10464 bytes
SHA-256: e86905037023403d4fba07470e0764de6790ffa2b0b968dd5e03e1c9363ffeda
font_02_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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