Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cc8a3e53ca5809…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 09:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ece0d2ae36b64b84d091afc33beb7939 SHA-1: 3e53747d7ac59ab19406c92cb442c7488f19abe7 SHA-256: 20cc8a3e53ca58099b96f8fc4cc9158b6fbb981e4ad2306ed4e14d5ba7c16776
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=mary+poppins+movie+poster+1964 PDF link annotation
    • https://cdn.sqhk.co/vomuvojovi/eWJghgj/tunofudoxoxumusoxe.pdfIn PDF document text
    • https://kevavakupote.weebly.com/uploads/1/3/4/3/134324476/tulow.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/bgfAEig/light_up_mirror_for_wall.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/aurelius_gotham_city_research.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/39774140139.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/45854822347.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/e52c42adaf0b.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/RggWuDJ/dr_reversi_game_download.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/560113725.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/jiiAgja/flower_zombie_war_unlimited_money_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_52918f9966eb4f4f8a3110f73b3dae8c.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f6c1828eb4d74d738728dfed47497a07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5328e97d-63a3-4f97-9431-d00b1530be87/how_long_do_you_cook_eggs_in_pampered_chef_egg_cooker.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_f1235069cdf64a2188ed7efe73692e78.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_9f5795df07b744cca827ba04bd48da85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b035d73b-4057-493c-909e-6533cab305aa/7747394973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f707852-a84b-423b-8953-f989aac13b7b/88656299949.pdfIn PDF document text
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_73beff860e614edb98d19f506d098340.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_489879b21c3943a699e3fb3805e9523c.pdf?index=trueIn 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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 5548 bytes
SHA-256: bff34ae0289d55cfc978a805ec78a0c878918252abde0d1567cd44861eadd11b
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 12936 bytes
SHA-256: b36adb5b831d86deaf1f61725100924cff551b72d2fff95552578c30dc4e9442

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