Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8884cadbd4de7cd…

MALICIOUS

PDF

85.4 KB Created: 2021-04-01 11:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e98e27237a03b04646524a41cf3464f SHA-1: 29419186f6be246e77b9a043ddeb91aadadb1c04 SHA-256: e8884cadbd4de7cd1df443822292f92c85a34610ffc2112ea7194c20e1558626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and numerous URLs point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/award?keyword=approaches+to+talent+management+pdf
    • https://cdn.sqhk.co/nivipanevi/eDgjvjf/smith_knife_sharpening_system_review.pdf
    • https://cdn.sqhk.co/wejagamewo/j5Zibid/57782675563.pdf
    • https://cdn.sqhk.co/mivezifov/c7Mifjg/41488389727.pdf
    • http://lexusesadedebaz.22web.org/xaxejojitux.pdf
    • https://cdn.sqhk.co/dewufidabo/iZB6gi7/oscar_de_la_renta_dresses_amazon.pdf
    • https://cdn.sqhk.co/kubepugemaki/gehh4hj/power_rangers_super_ninja_steel_gold_ranger_sword.pdf
    • https://cdn.sqhk.co/mavixuwaloz/uifX5ii/82689149962.pdf
    • http://vududodudo.22web.org/13333672242.pdf
    • https://cdn.sqhk.co/jojikoxazew/abgiaGi/jurassic_craft_mapa.pdf
    • https://cdn.sqhk.co/tawibonikigo/egggej8/learn_romanian_free_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_2e3f54abed444af08a5e114824d17c20.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_33de8340b1e2467bab6f5996f4c08cfc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a34fa90-b4b9-4893-9a07-4180fa18e1f7/stephen_hawking_younger.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_de8ed64fb86e4cf78a57f46bd5b84335.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_80ea19768eee4e8b8fd7f873138dd91e.pdf?index=true
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_9d9a4e293b28412b8ee9f65d16eecba1.pdf?index=true
    • http://bunopudo.rf.gd/free_reading_comprehension_worksheets_for_12th_grade.pdf
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_52430ac1d2c743c7b73b834e0e510ee9.pdf?index=true
    • http://zekinipumulo.epizy.com/zuwed.pdf
    • https://uploads.strikinglycdn.com/files/91a36e05-aa67-4d1a-bf72-85306cf0a5f8/dyson_dc50_brush_bar_belt.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_f845e9fbc9c34c779bcb70fdd97b7774.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85fb2d06-71dd-4570-815b-9cf1343dd45a/harley_davidson_touring_service_manual.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_51ed7d7703a0435a9aa59277c9be19f8.pdf?index=true
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_4cb90ab4b618419eb9b43a3bdb9a2d1c.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_off000103c7.bin
1836ba4da0d2ed6284bc97681c8000277718f2b51df6f4100268ef776a6cea77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 5300 bytes
font_01_sfnt_off00011593.bin
7cc1a0ef734a8dc17d91ee5779c2e79a7bf503b156aa63366334de775debc45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 10680 bytes
font_02_sfnt_off000139f2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F2 4324 bytes

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