Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cfa7aaddcebf3b…

MALICIOUS

PDF

78.1 KB Created: 2021-04-24 05:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d722336b756b6651fa9a1f2caa8b73 SHA-1: d93584afdb55ba83e3f077d80617c2dcdac7ae7e SHA-256: 71cfa7aaddcebf3b38c16a6945af059e266927fe9df15b0ab3f4dcc9588eae8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book synopses, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the presence of numerous external URIs points to a watering hole or phishing attack.

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://resalured.ru/strik?utm_term=miss+peregrine%2527s+home+for+peculiar+book+synopsis
    • http://uggi-ugg.com/watchmen_2009_movie_download_in_tamilyogie7m81.pdf
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5ffe849ba5089.pdf
    • https://pawajapik.weebly.com/uploads/1/3/0/8/130813804/7f056e.pdf
    • http://koteyarn.moscow/lexis_audio_editor_apk_mirrorkkda8.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6024710a312a1.pdf
    • http://buyfastedcircle.xyz/yes_please_vs_yes_please2jpru.pdf
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/lubisodegox-bexaxemunaxe-vapesur.pdf
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/japonuxazitejaw_soris.pdf
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/wufositi.pdf
    • http://24goodstore.site/fume_cupboard_face_velocity_testingikyoq.pdf
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/serulotamokis_dalukiv.pdf
    • http://dreamingdeveloper.com/52537414840wprwm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_5c0d0efb4c5049879b7ce17b10bf21b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/972ad460-0f08-4de7-9a6a-fd2596887231/craftsman_16_electric_chain_saw.pdf
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_cfc342796a5c4af6b79677f1e2e24b10.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_9534bd98532749c0972f91413a1c8d52.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_c13ebab4c29f49bea653ec24373364b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75127f04-934f-4f97-8718-61d64d7639b3/rifebodisazof.pdf
    • https://uploads.strikinglycdn.com/files/0c63ea7f-461b-4126-8043-2490fb86a597/dodukuvizopapuranifede.pdf
    • https://uploads.strikinglycdn.com/files/00c28888-e5bd-4a89-a34c-72a9a992a3b7/how_to_reset_nighthawk_carbon_monoxide_alarm.pdf
    • https://uploads.strikinglycdn.com/files/f840156f-b7ab-4f25-a45b-550cf597a88b/manual_de_carreo.pdf
    • https://uploads.strikinglycdn.com/files/df634a57-2651-434a-a4ef-aac1a335601e/88203349568.pdf
    • https://uploads.strikinglycdn.com/files/2e156620-49d7-4c14-8778-894c313a8e38/jasasajo.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_off0000f0f5.bin
214cc2863f5593f219f2a6369d26b0c5091ae24f67f4e7c92e6b30c91ed2a89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 5776 bytes
font_01_sfnt_off00010498.bin
0936563751c006e69fd1b4c26327c918d12b44b5d08d7baf415a092989ba7766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 10668 bytes

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