Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb61caa6b5bf1a7…

MALICIOUS

PDF

78.9 KB Created: 2021-03-11 16:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b876911d18ce0b71adea8fbfcc51b30c SHA-1: dd49b0a6345a551222fd1b5efb5be84d4c399c28 SHA-256: 7cb61caa6b5bf1a79c800fce5ccdf45217d4f6d0c777fc67c744615e030b0fd8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://nipisod.ru/award?keyword=joindre+des+pdf+en+ligne PDF link annotation
    • http://help-bluebadgecenter.com/87322092966xd9fz.pdfIn PDF document text
    • http://leyloften.online/hacken_malmo_ff_live_streamhkkcz.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/56761453673.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/44317290100.pdfIn PDF document text
    • http://olx-delivery.cc/33101490608407lj.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/wamazojoninalinude.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/b1f3a0f2-afd7-4c7a-a2d9-1032040750ca/suing_a_county_judge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dce3df7-39fe-4e11-b9d6-9913321a59e9/zorarujabizominivena.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_1d20e89a20f44c8a9b8bb367410719dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a31cbfd-c22a-4de7-a515-ec20022e4d90/how_to_get_a_baseball_bat_in_gta_5.pdfIn PDF document text
    • http://basorakujolos.rf.gd/78533022845.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_dd2f4a9b98fa4160ade8d389d66df4ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/477e89cc-923b-452f-bbb4-1b79f20a7a3f/mobility_scooter_battery_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361ab829-b229-4d8c-9789-a5d641835ded/common_core_math_kindergarten_michigan.pdfIn PDF document text
    • http://zusewijoje.epizy.com/foselaxeziluvirapilawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c2a96e-a761-4f0c-930d-525eff92b567/tazoxofurudaxugamarifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9da461-621f-4bdb-9291-27bcf5e9c77e/giwikivetatow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d143e399-cde9-42be-a4ed-352d3ec525ba/xemivopufonifuketelupipa.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_7ac96f934fdc41639e5dc6d83a4a68b0.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_e777876853f5473fab95a4eda4108111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e804e859-ade2-4a28-9453-a2f8195dcbb7/95374897848.pdfIn PDF document text
    • http://wegatanubuguze.rf.gd/7480644078.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_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 4988 bytes
SHA-256: d240ead18b5f45c098065fa513c0d897daefcd79b67147191e2a625eb60f156e
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11964 bytes
SHA-256: fa598c98233a051acc090c004d737b42d2e82d3be63c99b56ccecc344a73706e