Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f65ab986d3402dd…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 16:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25b4192acf6536ab1e28726c513f5ecf SHA-1: 6897dc0a3177f5530fd08f5eec715c3163c6855f SHA-256: 1f65ab986d3402dda40d064d4accb1febc5d03da3d40cc9bd55a1901e6cf4606
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

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://resalured.ru/wix?keyword=2+good+2+toss+pierce+county+jail+roster
    • http://balegetiwep.mywebcommunity.org/dd_wrt_router_not_connecting_to_internet.pdf
    • https://cdn-cms.f-static.net/uploads/4408706/normal_601749557f747.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fd0fbf1e2aba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_cb19abb901ac49a38f174d7c56ab27ad.pdf?index=true
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_d5caf208ff784984aaa058498ae62bf5.pdf?index=true
    • https://s3.amazonaws.com/fazujo/autocad_2020_crack_xforce.pdf
    • https://uploads.strikinglycdn.com/files/1d36ce1b-9bae-4acc-a7b5-10ddec80ede1/excellence_punta_cana_all_inclusive_deals.pdf
    • https://uploads.strikinglycdn.com/files/acbc72a6-3844-4aaa-b113-7cd2ca44118b/xeroposanuvovik.pdf
    • https://s3.amazonaws.com/sefiwegegagu/roxiwek.pdf
    • https://s3.amazonaws.com/miledu/tovumebisilowugatutu.pdf
    • http://koriwironawuva.myartsonline.com/scanner_canon_lide_220_fiche_technique.pdf
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_9fe437206b7f468ea90670ae97b3848e.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/90681372762.pdf
    • http://vidugozu.atwebpages.com/how_big_should_a_chicken_coop_be_for_3_chickens.pdf
    • https://uploads.strikinglycdn.com/files/acdce72a-d5a9-4f33-be31-e82d2e7cbdc8/63545160422.pdf
    • https://uploads.strikinglycdn.com/files/363afb04-62c4-4c5a-8137-62695daad8c4/mibeleguralivusiwimonub.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_03e7b65a55c14941a218362bf855121e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9c18c47-fd10-4d7c-9ab8-77a1d091920b/english_pronunciation_made_simple_audio_cds_4.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_off00010082.bin
f599452e6207849caaa41cdf3ebc8c34957a89fbe47d5f5d820cc91da53d67ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 5456 bytes
font_01_sfnt_off00011330.bin
a7e9c047c1d192fe2457c93b79fb41efcbe6559a327b639bf7e4a5883344401b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 11040 bytes

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