Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2422af15c5cc11b…

MALICIOUS

PDF

75.3 KB Created: 2021-05-10 08:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6a7f130ec6bf4c36a19346ab6875d692 SHA-1: 60d39a0b74200d6696ce757c6058110308f55829 SHA-256: b2422af15c5cc11bb7459c4ac8d60afd55a5dec2bd0591803894d7ba83c81655
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

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
  • 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://yafferge.ru/strik?utm_term=klipsch+promedia+2.1+bluetooth+speaker+system In PDF document text
    • https://cdn.sqhk.co/zetuzire/OiesgeM/dune_hd_remote_control_programming.pdfIn PDF document text
    • http://kyrgyztours.com/59494064945l1pez.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/hbNhcie/truck_simulator_usa_mod_apk_download_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jaihjhZ/cartilage_vocal_cord.pdfIn PDF document text
    • https://jigupeditu.weebly.com/uploads/1/3/1/3/131380623/podufigizev.pdfIn PDF document text
    • http://fastgetme.online/294422676349jtak.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/06FZicg/gw2_crafting_professions_guide.pdfIn PDF document text
    • http://itdiscounts.info/rukizukdyong.pdfIn PDF document text
    • https://dowanolisedu.weebly.com/uploads/1/3/6/0/136056386/295444.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/mufoxopegivesower.pdfIn PDF document text
    • http://datab.vip/what_is_the_meaning_of_thomas_in_the_bible18nj7.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/df502b49-5b3c-4083-92af-303d657f8efd/70511305975.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_8f165c73356645a4b21fe67c5bc218e4.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_f873d1182e2f4d22b9c7095e8258988d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f4c33d-90d7-4a02-ac0c-76e5395ca9a4/67852943579.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_380de9ebc983485980c7e3414f4533b3.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_3d0e7eeb38bd418eb8c435ed58016a1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b431333-ec30-4b16-8b5f-a6b167e4bad8/how_much_does_it_cost_to_replace_a_honda_accord_starter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e591ea65-9938-4002-a0ce-e86680d83f43/how_much_is_the_army_civilian_clothing_allowance.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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 5804 bytes
SHA-256: 992f750c40991248c196165156198cc99370491347cada4f766e2f0bb96b21e1
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 11472 bytes
SHA-256: 17d5d66f95ddb0ac778b1973ef4b941a7cf111337096c6f89f6a134231cb85a1