Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d434c5130b0cda…

MALICIOUS

PDF

66.7 KB Created: 2021-03-16 10:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 106885f81be86ce9cec636d7b0e3ad16 SHA-1: b0d7109d54490fa069d8dcdbb8766cb12659a038 SHA-256: 10d434c5130b0cda6eeaadc614089343cda54ea73a8220f0305dd23a02640e94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, detected as a link farm. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs suggest a potential phishing or SEO manipulation scheme, aiming to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=probability+density+function+example+problems+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388040/normal_5fffe9810fbbb.pdfIn PDF document text
    • http://arthromedshop.xyz/867257346003wb6i.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/giqjfge/libro_el_arte_de_la_guerra_audiolibro.pdfIn PDF document text
    • https://cdn.sqhk.co/nawafoxobok/bizjfmo/49041243915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_602a9471576c0.pdfIn PDF document text
    • https://zekupepub.weebly.com/uploads/1/3/5/9/135992873/kepotago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_603da5784b730.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/hydroxyzine_davis_drug_guideprqgd.pdfIn PDF document text
    • http://1offpark.xyz/what_are_the_steps_in_discrete_trial_trainingao2c7.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/qhbhagg/jelamadisarafefogedul.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jfgiB4N/shake_shack_order_now.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/yhjhii9/impossible_game_online.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/9737629.pdfIn PDF document text
    • http://b0xberry.online/metomaxixobide40dkx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5ffdb558a9924.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/HFXjblE/37680847501.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/heFhgbM/the_factory_restaurant_jersey_city_new_jersey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_44eb0c8bd8e3417a961cd44b749d584e.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_ce7f8e3ae99c4d07a861108d3bf43d77.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_9ae3b184364d4daaa08454c8abea3e4e.pdf?index=trueIn 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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 5612 bytes
SHA-256: df62454e8e05727435610b7bba3f2b22527d07dda0d536e38c126fffe36c0661
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10056 bytes
SHA-256: dd5afeaf9c9932cbd0b734453994c0336e415c368454c77c5c1ee4c64f31d6c4