Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45910867df17673…

MALICIOUS

PDF

75.4 KB Created: 2021-06-10 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e319840f43e9db05a029c9e55d8f3c05 SHA-1: 69ee6f1f8ce00cde513ff18709fa879e355086ed SHA-256: b45910867df17673baefa4c269e4dff071ecca406c74f21ca2f3e30c1f0fe022
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=prehistoric+archaeology+by+dk+bhattacharya
    • https://rowevitos.weebly.com/uploads/1/3/4/6/134687190/d2cb66d.pdf
    • https://vopezewom.weebly.com/uploads/1/3/3/9/133988608/kesuganovubaza_fufejatoso_merapane_tiwirib.pdf
    • https://cdn-cms.f-static.net/uploads/4450347/normal_601bfead684d6.pdf
    • https://nuvugokub.weebly.com/uploads/1/3/4/0/134016684/facd9.pdf
    • https://lenoloxib.weebly.com/uploads/1/3/4/0/134040664/zewibake-lipaxefabativu-rufinufure-tefawogima.pdf
    • https://static.s123-cdn-static-d.com/uploads/4424683/normal_60b632dd69840.pdf
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/sugorinofonif_dewupotabivubu.pdf
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5ff96c719ba55.pdf
    • https://cdn-cms.f-static.net/uploads/4413117/normal_60177e93d2c91.pdf
    • https://cdn-cms.f-static.net/uploads/4457298/normal_60bbc6cab5038.pdf
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5fcd8bd5b6552.pdf
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5ffef81c9ec69.pdf
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/d12b261.pdf
    • https://nevetutofipodel.weebly.com/uploads/1/3/4/6/134600430/xosajaxewawax.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/vazuwanurarajo.pdf
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5ffbd8e847420.pdf
    • https://norokeveja.weebly.com/uploads/1/3/4/7/134706326/9680093.pdf
    • https://cdn-cms.f-static.net/uploads/4470028/normal_60bc00721ab39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuvabufoj.pbworks.com/w/file/fetch/144565683/how_do_you_make_group_funds_in_roblox_2020.pdf
    • http://nuwiwaweber.pbworks.com/f/68128445566.pdf
    • http://pazimonofe.pbworks.com/w/file/fetch/145011669/process_of_portfolio_management.pdf
    • http://nidibewuzi.pbworks.com/f/full_and_final_settlement_letter_to_employee.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin
67470733b8dd9f063524546bb4f0f51afd213e124c77a8cbc258fa7c191bfb22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 5508 bytes
font_01_sfnt_off0000fc0c.bin
dbfe2ef89d7a620d5b3bcbf9ff80e201366ac3f28bd412a51862d6675f7de8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10468 bytes

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