Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1d72aa1baab829…

MALICIOUS

PDF

83.5 KB Created: 2021-04-02 11:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3392a2cd1b32b74967f9274c108b2b7a SHA-1: 056ae66883f8035877a111820ef2da4e508cfadb SHA-256: 7d1d72aa1baab8295a9d740504ad41965e5f70d4fdfcf641f2857dc0ec30fbc8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=airsoft+claymore+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465025/normal_603a136c23730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456666/normal_5fe3c8dbe6f97.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/40561890725.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/14077520962.pdfIn PDF document text
    • http://yourlivehelp.com/pelicula_de_spirit_en_espaolou7d0.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/cuore_cremisi_amabile_giusti.pdfIn PDF document text
    • http://4bochki.ru/how_can_i_motivate_myself_to_study_quotestsvxx.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/captured_by_raiders_download.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/wiropotivotebizozutexig.pdfIn PDF document text
    • http://grenkasalo4.xyz/nautical_life_latest_mod_apk_2._123xf9l8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5ff8b850d80eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_e53aa9856867407cb6918a3d757761b4.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/sakofeletogixuvumiko.pdfIn PDF document text
    • http://kanulojijuk.rf.gd/raw_vegan_recipes.pdfIn PDF document text
    • http://nijunopuk.rf.gd/airwatch_content_gateway_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08f799a-2f7f-4308-969e-3407fdf4aece/69353776867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d479b3a5-ce07-49d5-95eb-05b09272c385/how_much_is_a_cochlear_implant_uk.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_72a1caa8e9c84970b9a4d70f5461a0a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20e5c32-87d9-4a59-a918-4a3928e8c9a4/partes_de_una_revista.pdfIn PDF document text
    • http://bapisebetunijod.rf.gd/56178706897.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 2996 bytes
SHA-256: fd7ca904a086d7e4d4549ff606d429cf8a246d475548939133b0259e316ca2cc
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 5168 bytes
SHA-256: d3ac1f6291d32aa06e8a7a6ccb5b2a7c9b995420622040a55366bca817a77998
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 12136 bytes
SHA-256: ab1ccda6e3c4dd22b2b161288c1df580445247d38fd143c6a4ea395ed3ad7c69
font_03_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 16356 bytes
SHA-256: 20aa54a76171967c95a01118eab9c4df723f608536b9256e132745479fd7b3cd