Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd091eb9069c5e…

MALICIOUS

PDF

80.7 KB Created: 2021-05-16 11:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 550734e90fe3743be4d384bffe7f59c3 SHA-1: 7e11991eefeb401d73db4b796607442774972a54 SHA-256: b7cd091eb9069c5e3f60ba053419e766265900e54b9546588bd6a124c570c9db
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO spam or to direct users to malicious sites. One such link, 'https://nipisod.ru/strik?utm_term=how+to+set+immersion+heater+thermostat', is flagged as unknown reputation. ClamAV and ML classifiers also identified the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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+set+immersion+heater+thermostat PDF link annotation
    • https://cdn.sqhk.co/tamenotu/Y7rjLgf/shadowverse_liquify_guide.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/8839593.pdfIn PDF document text
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/1126224.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/gbGjfje/lunoja.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://s3.amazonaws.com/degagaziv/informacion_sobre_el_capitolio_de_puerto_rico.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/idaho_falls_soccer_complex.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/midnight_sun_full_movie_download_in_hindi_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/ac_market_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/how_to_use_sam4s_cash_register_er-180u.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/67613495216.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/fobiwizokomubox.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/40927275974.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/what_is_the_natural_boundary_between_north_korea_and_china.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/nerilawenesifa.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/hyperlink_excel_sheet_to_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/54225286831.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/14968091666.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/red_miniature_dachshund_puppies.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/75203088367.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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 4736 bytes
SHA-256: d6900d3908d2b182986bd02918ef9ae18bea4bb0cb607ebcb81416457e9b6ceb
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 11228 bytes
SHA-256: 45fc75c81a2b82da45f0036d8566be08dc3f91f275ec3202451eee28e8477f61
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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