Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56512f1a94629a5…

MALICIOUS

PDF

85.9 KB Created: 2021-04-18 04:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: edbbf177ac89d25d8e1f8e1e0bbbd783 SHA-1: dd86145ec288db9569c8217fdcc82e717c60f945 SHA-256: d56512f1a94629a54209dc29008fa8c868982457e45c80177540ddd6cc338a61
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 0.9997

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://jumiwimov.ru/strik?utm_term=rules+cribbage+beginners PDF link annotation
    • https://cdn.sqhk.co/wufotubi/iVhejgh/ropowiwapinawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5fcdee72c7ace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fe4e842f0849.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/iegiNia/42103755158.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/jgjd3jg/71922456111.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/qdpheYq/the_survival_hunter_games_2_apk_hile.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ejdjdjg/todoist_apple_watch_series_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5fe53d8824fa4.pdfIn PDF document text
    • http://lotto-investclub.com/13436892038advbk.pdfIn PDF document text
    • http://agentsoft.space/best_utv_side_by_side_2020d8uzh.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/Xvhdiac/filojulalosege.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ibKOxHm/zawuwefepaput.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/W0wjjia/lorozon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_7c15560eb0494449b3fcc11ef11d13ef.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_2a6e0fb63a35496386f919f06a72d887.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_520a5492d6c24de0872704c311d973a8.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_903507b06f9d4dffabe8165a4bd6882c.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_b86645e3ac1f4eac9b142ea5c3cd98bb.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_0c0ae1f22d52469391c3a4cc91bc4be0.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_fbf3dae67e1542b5acdfab821e047704.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_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 5112 bytes
SHA-256: 93514757cb023d69e3fb1c153043f722547303796ec6bfe5f08cd14fbb1a77bf
font_01_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 11100 bytes
SHA-256: b77d483737603b3468f42fc8f36663df0e34bdca8427e467b68757149bcf7de0

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