Malicious PDF — malware analysis report

Static analysis result for SHA-256 865d32908249a493…

MALICIOUS

PDF

83.4 KB Created: 2021-04-09 09:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f88b9770dda65d8df5a4dea98e32002 SHA-1: bb23cae58a44b412a46caa955f41f9e2a846dd4c SHA-256: 865d32908249a4931f381f2441bfb675b3db2409e2eb42d83e6fc775cd529a75
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://nipisod.ru/strik?utm_term=how+to+change+the+strap+on+a+citizen+watch'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM', suggests the document is designed to drive traffic to malicious or scam-related websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam.

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://nipisod.ru/strik?utm_term=how+to+change+the+strap+on+a+citizen+watch
    • https://fufefofixikulo.weebly.com/uploads/1/3/1/1/131163927/lufujofak-mufibudinakuw-gibon.pdf
    • https://cdn.sqhk.co/nogawevorus/gEbhdgh/dentist_assistant_school_nc.pdf
    • https://dupomosukafe.weebly.com/uploads/1/3/5/3/135387566/joxulimo.pdf
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/vuxoluwunesigapapo.pdf
    • https://cdn.sqhk.co/detazido/bq6H8mL/18104925381.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/xebibonubudula-bidusugo-nadamovipep-mavutot.pdf
    • https://cdn.sqhk.co/zejegure/5h8o0ja/obstructive_sleep_apnea_anesthesia_guidelines_pediatric.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/farowug/giwozonidejijiduwid.pdf
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_f9ea35489ce843098e6a924d06f67c18.pdf?index=true
    • https://s3.amazonaws.com/lawakux/vintage_schwinn_stationary_exercise_bike.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_24dcedadcc4948038c44f5a41a9eda89.pdf?index=true
    • https://s3.amazonaws.com/nagudo/chicco_keyfit_30_base_instructions.pdf
    • https://s3.amazonaws.com/fobupojowojon/vunijavozisodu.pdf
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_462c9c9ef3034c318fefb73b48b1b437.pdf?index=true
    • https://s3.amazonaws.com/jamuluvuvava/best_budget_robot_vacuum_and_mop_2020.pdf
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_69d0aea4c79c4a28a16a2bb7e1886f37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76c72da0-45eb-4ea1-9d8d-d7e16a0fd123/bitaradogoputabagu.pdf
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_852458acd4274716a476ef6f231ee5f4.pdf?index=true
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_26b9a5d968c54e50b1985eddd52eb2bf.pdf?index=true
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_df16aa323f344eac8796529a578958b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cafafbbd-30d4-472b-803c-e46435712413/how_to_factory_reset_iphone_5c_without_passcode_and_computer.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_off0000fad2.bin
56019d03aeaf8d8cbeb834787a129e166a3ef89659ab040980ea965c03950e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 5052 bytes
font_01_sfnt_off00010c07.bin
d16d577dbc2a1558d11bb10b777f2890b3287496da54eeb95f327ccbd486368c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 11100 bytes
font_02_sfnt_off00013182.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 4324 bytes

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