Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca7d43415405aad…

MALICIOUS

PDF

83.8 KB Created: 2021-05-13 10:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7b939d56af80c16ea34bd86ab2f750a8 SHA-1: 58c6df0954d14da1222187e6b0e3e5e1231ca63d SHA-256: 4ca7d43415405aad15099e1981e248258bbc2b59762b25584d9c2add2b55f9a3
186 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many hosted on disposable domains, designed to redirect users to other PDF files. The primary URL, 'https://baarspo.ru/strik?utm_term=hamilton+beach+coffee+maker+k+cup+instructions', suggests a phishing or scam attempt disguised as instructions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=hamilton+beach+coffee+maker+k+cup+instructions PDF link annotation
    • https://cdn.sqhk.co/kominepoli/ieibFgc/94987170389.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/fepijujonevidi_dowasoriwuxutu_sozevu.pdfIn PDF document text
    • https://mizujaketoki.weebly.com/uploads/1/3/0/7/130776151/nejep.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/Rjdebgo/movies_moore_theater_south_haven_mi.pdfIn PDF document text
    • http://vorecan.fun/54391770251swyzi.pdfIn PDF document text
    • http://gbo.guru/seborowivegusepipev6r47.pdfIn PDF document text
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/8302618.pdfIn PDF document text
    • http://dimax-matrasy.ru/mivijewofimoririwomugxl8p.pdfIn PDF document text
    • http://itdomen.fun/tazijipuruludinufolawoo4lqb.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/gk14wgh/little_panda_princess_makeup_mod_apk.pdfIn PDF document text
    • http://copyrighthelpptteam.com/forces_and_energy_study_guidehrfqw.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/w9Xhh9f/clash_royale_card_rankings_august_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b12183c-9914-40d5-b06e-16059cfedf61/28743734802.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_fcd832e314cf4c8bbcb42ad7f7a7644e.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_cf60838d593c42aea9ba110701301894.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_f5ad7b7a014142c08d52d6631b866566.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f65c906-822c-41fe-b450-3119d3b8a145/what_should_my_oxygen_level_be_on_oximeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bcc8e8-11b3-4042-bc15-5589b89f0c75/how_to_replace_your_dyson_v6_battery.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_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 5420 bytes
SHA-256: 51e5ad4f5050a06d9902121489bd2e90cb34b6c58b66229d7eec20e8f78e925a
font_01_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 10908 bytes
SHA-256: 957d949102cba53d5814c3a02b77b57361455dfbffcdab7ce17bc244eb73d550

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