Malicious PDF — malware analysis report

Static analysis result for SHA-256 1891a48d7be89707…

MALICIOUS

PDF

78.5 KB Created: 2021-03-07 13:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32e05f950924d40c81e4fad259936242 SHA-1: 208436c1381e92dc8eeff10dcb843d86e2805e49 SHA-256: 1891a48d7be89707055958fac17fd07dff7c80a1af000b1a10ff471ff68996b2
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several of these links lead to known malicious redirectors or are part of a link farm hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=baby+bjorn+bouncer+mesh+vs+cotton In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_601549bd47845.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/3jjEejc/earth_online_live_world_webcams_cameras_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/Tz9ZmEq/offroad_outlaws_hack_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/UNgiajc/bujimogenavuzuwepogesof.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/2ihhjGQ/vagazugopenovag.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/Xgfhbjb/ten_facts_about_spacex.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/0ghgzja/12196759779.pdfIn PDF document text
    • http://revukajazoweku.22web.org/50019762302.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/wrEnjc9/power_rangers_legacy_wars_character_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_6008f5101167a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_9791d0dbc1444f5c952c709ac6549735.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_a1c3bbb69129498bb32cf41dc2dde0cb.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_a92af64a7e0c43669019cb2798f5d4c7.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_57b7afdd83464a1dacc2cea5ab4e6ae9.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_5a34c6d7fa0f4a678cf60c81544e4626.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_6f4b7d2ac785435a98c77d8dcc914ffc.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d4f24edf18ad4f4995f372027369b767.pdf?index=trueIn PDF document text
    • http://nojekakanafigi.rf.gd/savenil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 5436 bytes
SHA-256: 1f5ecd807c4ca5d677c569f0cfc339100c3b72e3acead8e89340a079482b4216
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 11116 bytes
SHA-256: fa8e9d7231a112d550d4c39a769b3db24f079385f08b553ba1dc5e209f336c7a