Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bcb4bb8e3e9ad4…

MALICIOUS

PDF

77.2 KB Created: 2021-06-14 01:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7d36a218a2872be64e21b5604f246f65 SHA-1: 9f36b05a81a63f9edb60aebd50566074d84dd665 SHA-256: a3bcb4bb8e3e9ad4a8a458ff1352cd54b18016cc6331d110aa11a39f7d381f2f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=how+to+tell+about+your+weakness+in+an+interview PDF link annotation
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/1403052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6046d6ebbc12b.pdfIn PDF document text
    • https://zisawotagaxikad.weebly.com/uploads/1/3/4/4/134478332/lakudupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_601d7332b4ebd.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/biwosojogubiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_603201737d97c.pdfIn PDF document text
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/7f8c0f1.pdfIn PDF document text
    • https://wenadowepafim.weebly.com/uploads/1/3/4/3/134314247/busumovu-wobevowunig-legefozovabenam-figupugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_6041339bc582d.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/3256179.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4498702/normal_60b7443fd157b.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/toreza.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/02a64a8d-b523-488f-80b5-9a278646049a/how_to_reset_soundbar_500.pdfIn PDF document text
    • http://bajaduxaxusi.pbworks.com/f/melnor_water_timer_sunrise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43f857c-cf81-4256-a2fd-73073a2bb0e0/66558782291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2720c978-4888-4417-af8d-6b4f44d7bf55/74198387758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e901ea71-b570-4e86-b247-3f5df2a69810/how_long_does_red_cross_cpr_certification_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9c83de-213c-4b2e-82d8-d52cce036976/41734465931.pdfIn PDF document text
    • http://zopilep.pbworks.com/f/46418067808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fccdafa-8b7a-4ec0-a3b4-c1adb9280688/minitool_partition_wizard_professional_license_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a4111d-e415-40d6-aa05-5daba3042d3e/zorajomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88be8c8f-706a-461d-a437-2f3e38b60761/naxeex_superhero_mod_apk_old_version.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 5096 bytes
SHA-256: 49b01b6ccfcb84cd88be06f3589075073b176c6e293f9a6cee28f99b5208871c
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10528 bytes
SHA-256: 43405244b2e90b924738aa023cb9972dcb6dbb54808207f0afa93934f3192810