Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ae221d357a2adb…

MALICIOUS

PDF

90.8 KB Created: 2021-04-21 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bb409f986be0ab016f1b04f9dd93f70e SHA-1: 4b18fe951231f09cacb0927c88e92f04aa9a63fc SHA-256: 44ae221d357a2adbf427e7ba8f70de69008381e6600a04918a63164ff6711ad2
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Sql server interview questions and answers pdf', likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=sql+server+interview+questions+and+answers+for+developers+pdf PDF link annotation
    • http://lexaxak.mywebcommunity.org/mechanism_of_adverse_drug_reaction.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/67481718009.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/geramiwaweroxolototaxogauplu3.pdfIn PDF document text
    • http://dokumenty-kiev.online/why_is_my_generator_engine_surgingr6bid.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/que_es_liderazgo_transformacional_y_carismatico.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/articulation_of_form.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/gakabakoxonin.pdfIn PDF document text
    • http://sobakin.space/71311230361lt65j.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/vida_y_doctrina_de_los_grandes_economistas_gratis.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/attrape_coeur_salinger.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/fundamental_of_mathematics_statistics.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://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_224912bacf6c4b6e8a581402dcfe3d77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/93141619096.pdfIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_16d111a4be4c44a2b5886e42dd002ec1.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_d2854697a2c54624851903e92573b492.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_f1654ee23248473b8c32d1cb9e83f50b.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_6b92d144a07a4769ac0a1dd89344a4be.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_5bd3583cb437458790cb79ca51443047.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/10374807350.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/runiwa.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/walmart_covid_vaccine_registration_florida.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_405dd1222062437bb2951fff0ad0a0c8.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_7a44d8bc313f4e21ad9c6710bf21a477.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/download_apps_learn_korean_language.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_61872d83f77b40a08852fdfb94bb9e9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/daruwujegov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 5296 bytes
SHA-256: b923fcdb77859b05ad1fd56c192670c948c161ba68b79960f789b1e0d1e729e6
font_01_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 11020 bytes
SHA-256: 09354d4e6531a8c34e6cfc8a21d6216bac2440ab8392537241f411b6f4616c36
font_02_sfnt_off00014e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E73 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.