Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad8504e22bcdc79…

MALICIOUS

PDF

74.0 KB Created: 2021-04-12 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2825f29063d0d5d6cc7e6a6825951532 SHA-1: ed198388fb5f3509d8942690758ba2f9a9419717 SHA-256: aad8504e22bcdc79344a0a8bb020755db7aa50f2975f60f069f48728905e14c0
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggest attempts to redirect users to malicious sites or execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/strik?utm_term=is+the+servsafe+manager+exam+hard PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385614/normal_600932d9924fb.pdfIn PDF document text
    • https://vifewilepame.weebly.com/uploads/1/3/4/0/134012930/1344a83.pdfIn PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/fifirudili.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/wutowozutavoba_boziromopob_ziwavage_laxega.pdfIn PDF document text
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/1346417.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/mesilimilerutux.pdfIn PDF document text
    • http://siwetogiwiko.iblogger.org/curly_girl_method_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_60238cdf49a8b.pdfIn macro / runtime command snippet
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/medotogurejejojir.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/3ff445167.pdfIn PDF document text
    • https://jiwonilasipa.weebly.com/uploads/1/3/4/3/134313366/jubamijigolun.pdfIn PDF document text
    • http://gakuxalodakedaj.eIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_7af6ed200f8c4b0f949b7c46b54ca26b.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_21bbace441144fa39b318dbcb451932b.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_d3b2e7c5041741b48a3cae5ea087a5ad.pdf?index=trueIn PDF document text
    • http://vegodaravowes.rf.gd/a_midsummer_nights_dream_no_fear_shakespeare_act_3_scene_1.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_5401a24e484348d4ab92ce77116bb480.pdf?index=trueIn PDF document text
    • http://gakuxalodakedaj.epizy.com/principal_geotechnical_engineer_salary_australia.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_5400d5a1188d4328b775eeb911893734.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5356 bytes
SHA-256: 61edfc6305bc19ed7b0d257b8d945ec9ef2aec9f99e8b8d29ed4baa9041397d6
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 11072 bytes
SHA-256: 726863e0246c4211c8e7716a07f787c086beeea273864759843a355c32fb93d8

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