Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece6277d62bcbf08…

MALICIOUS

PDF

69.2 KB Created: 2021-03-14 08:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24bc68df25f1be9d63ca662d71c0c167 SHA-1: d2d9a8adf1800c8a590dae2ee57c9a4bf9236f42 SHA-256: ece6277d62bcbf08816c902b79110ff04b8bc968439644ca32e111ecf840b5ea
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, including a link farm heuristic. The presence of external URIs and a link farm suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=airlift+movie+video+song++mp4
    • http://uber-global.com/honda_2000_generator_specw4sg1.pdf
    • http://electrumwallet.buzz/bdo_fish_for_villagers7axs2.pdf
    • http://copyright-notice-ig.com/how_long_do_elimination_diets_take_to_workeg17d.pdf
    • http://mydenverneighborhoods.com/jibimfw1jw.pdf
    • http://stebsmeh.space/6425028404e2cfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vuliwisuwig/gemaworipuvuxujakazi.pdf
    • https://uploads.strikinglycdn.com/files/a1d59d75-2dc3-48ed-bea2-eaf2348cd1a5/adobe_flash_player_blocked_plug_in_chrome.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_743205063a084af7b66de7e241e1865c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8cd00abb-6a56-4893-af5c-ef7dcf2cec7d/yamaha_rx-v367_vs_rx-v377.pdf
    • https://uploads.strikinglycdn.com/files/855ca8e0-3314-4f25-9a5b-3490dbaa296b/89073398543.pdf
    • https://uploads.strikinglycdn.com/files/8cf413f8-d5c5-4bdc-a23f-f94a4f2bf8d0/32571613097.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/50758560877.pdf
    • https://s3.amazonaws.com/figidireki/lovarosoguxir.pdf
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_cbbeed0f39144f22a07943ffe8c55bc0.pdf?index=true
    • https://s3.amazonaws.com/wetowuzuxit/poe_lab_switch_guide.pdf
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_c611aa39fe2e42f98cfa128aa0438de2.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c650.bin
12a8475f77bf466532a0857224c66c5b963d84a08229df7f163dc04c6b13f955		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 5076 bytes
font_01_sfnt_off0000d787.bin
28a05a8f90f9264b3efa8ba3112e66bfb8953a9759b00424abae323c0b919f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 9968 bytes
font_02_sfnt_off0000f9b5.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 4324 bytes

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