Malicious PDF — malware analysis report

Static analysis result for SHA-256 52deed6397355805…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 16:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a2bddea25f203d6a3ccb03c5349945e SHA-1: 5caa4a95db9fbf7778163372d914937ea2af0f07 SHA-256: 52deed6397355805141733df7f7cc82806299cbe357ba47242c69af39fe4116a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The document body, though heavily obfuscated, appears to be a lure related to career preparation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=how+to+prepare+to+be+an+orthodontist+in+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6040d4f8f3e98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_5fc94b6aae66e.pdfIn PDF document text
    • http://wwbook.org/city_car_driving_1.4_1_mods5l3t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fd36f12b4e46.pdfIn PDF document text
    • http://orbitan.fun/2003_ford_focus_wagon_engine75rlx.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/7532c7f1e.pdfIn PDF document text
    • http://allfreebets.ru/air_force_officer_ranks_and_pay_2019n0lch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5feb6a36d51fd.pdfIn PDF document text
    • http://medyahanem.com/lixezesaparalvu7bk.pdfIn PDF document text
    • http://frukt.space/ncaa_list_of_banned_substances_2019pv68y.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/2711337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_6044682031926.pdfIn PDF document text
    • http://shop-kid-toys.online/bitozipuniresoporuvudmbg9.pdfIn PDF document text
    • http://storeyou.store/72651413837hylzy.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/8143587.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/5c5c40af-43fe-4fe8-babd-c32d950ff425/sanyo_kaizen_55_inch_tv_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2043e696-2832-4de3-ba95-2c3c62f817b8/how_much_does_a_junior_mechanical_engineer_earn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5768c516-64b9-4916-826d-ef99b86d9c5b/69410988124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e11b281-d85a-40f9-9b3d-3da4c5521c68/samsung_bd-e5300_unlock_region_code.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5528 bytes
SHA-256: bc47b137a7e2997be79d845a60e4ef83412dc16448c271c8c4dccad6166fb471
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 11092 bytes
SHA-256: 6c5bf5c8118994506b90a1831fc2b4b7f73d0fe45db5963dc11b184f06e75b30

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