Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dda3336d972c31…

MALICIOUS

PDF

84.6 KB Created: 2021-05-31 13:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038efdd1dffb89932cb104760587e683 SHA-1: e4074a4de9a480613f69cffcc52776727e3369d4 SHA-256: 55dda3336d972c3164a28bb12849240767db01a96d6b80441cecb0f5513e1b17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=igo+primo+gps+navigation+software+wince+europa+download
    • https://gelixilononusi.weebly.com/uploads/1/3/0/7/130775878/7197954.pdf
    • https://vosikobogoj.weebly.com/uploads/1/3/4/2/134235386/jagokewixotutezixi.pdf
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/5116311.pdf
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/bubinu.pdf
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/d0e7867783da.pdf
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/wibozufabesiv_figegizusolubor_jojijamuvop_daleju.pdf
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/sofizudisode_vovubenogifetod.pdf
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/beburakabuduso_xutaned_venanud.pdf
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/raralavufugelemamud.pdf
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/gitamajomituxeda.pdf
    • https://fefejixoloxit.weebly.com/uploads/1/3/0/9/130969032/bugeralepisa_botisimoj_gawaxisimop.pdf
    • https://zulupilasafa.weebly.com/uploads/1/3/1/1/131164294/2719352.pdf
    • https://cdn-cms.f-static.net/uploads/4483081/normal_6017f7aea45ea.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/7f94ac.pdf
    • https://marejeloxivel.weebly.com/uploads/1/3/4/7/134709382/40e5bf6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f47f1f3c-50ff-49df-b069-966388e3d893/house_tree_person_scoring_and_interpretation.pdf
    • https://uploads.strikinglycdn.com/files/e064fe35-271f-44db-a192-077369c4d6b4/38278155480.pdf
    • https://uploads.strikinglycdn.com/files/e31b381f-9acb-4700-99fe-3eddc0a244f5/lsu_football_workout_program.pdf
    • https://uploads.strikinglycdn.com/files/69eb66fa-3812-4caa-b61e-5ea75798e771/31551356052.pdf
    • https://uploads.strikinglycdn.com/files/6d7d71a8-a3b4-4f6a-9d68-b920a181a59e/what_does_my_chinese_tattoo_really_mean.pdf
    • https://uploads.strikinglycdn.com/files/99f2a566-8b63-4104-bbc8-edebc51ece9d/54509116000.pdf
    • https://uploads.strikinglycdn.com/files/8f82ff34-b2c7-46d7-9400-c9c52a39f65a/70463028783.pdf
    • https://uploads.strikinglycdn.com/files/f716cb62-6ee4-42f9-b705-0fa07b059c3f/fovajonusew.pdf
    • https://uploads.strikinglycdn.com/files/7686387f-592b-46a5-ab96-03f04a9d46b9/31263928679.pdf
    • https://uploads.strikinglycdn.com/files/66b2800d-6711-4951-b187-5428a6bc331c/58689211110.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010742.bin
ef077a50a875cb70898e9659f0886b7300790af0efe9dec4ea6d8b4fc7c9ef22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 5564 bytes
font_01_sfnt_off00011a32.bin
1ba383ca03aca6c7bca9225c0b798bded84c61b383a2aa0be7c4a33a8b9efa54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 13628 bytes

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