Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cef48e6af03083…

MALICIOUS

PDF

71.7 KB Created: 2021-03-12 17:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bce70a3eee950da25049de2daf162f3 SHA-1: 90b26960adccc3af42bf536ec8c1a0381574dd52 SHA-256: f8cef48e6af03083e0714487d2732e0fe60f770ee4094f1b7635f7799ce3a524
226 Risk Score

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. It uses a password-protected-archive lure. 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 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/wix?keyword=midland+x+talker+t55a+manual PDF link annotation
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/gofanot.pdfIn PDF document text
    • http://saveyoutubebot.com/918203890463k6lv.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/tawobugavasaz_rogeketusota_jitomedaxodadol_vivobebex.pdfIn PDF document text
    • http://berkeciftci.net/43862381696p97u8.pdfIn PDF document text
    • https://jalidinetuvumun.weebly.com/uploads/1/3/5/3/135333814/fonirijitofe-tikag-rujesufiverewof-tenavudujap.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/2427200.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/joKFRHH/xaferuzajudisifarug.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/Ds2ijjg/hero_wars_puzzle_game.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/zakikakowo.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/i7tZmie/33647939422.pdfIn PDF document text
    • http://igbusinessabouthelp.com/descargar_mecanica_vectorial_para_ingenieros_dinamica_8_edicionj9pik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_7380f156a3f8403fa91d4f5d6d5d5116.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_19d177ec22f24fcd976f9fd15cc4e65c.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_6867a692429f4a5d97491ee72913dad8.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_bcc44df597714766b0ce9b2036096f6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/nijozojexega.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_52397325c57143ceba360a0fca58d811.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_4704edb025714d3d8494c6f86ad6c531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegozegi/bumox.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/volidubatidopafapi.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_746f94aae01649a8a0f9265bf13ca3d8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 4828 bytes
SHA-256: 992a91fc7d874a0b6334d84b45731c50510265b2537cb1f11e13a62aab6d3482
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10708 bytes
SHA-256: e927ed3007745cda9cbcb99f29c05db64a38a69e62e95ec1a0c9db8860ceb1d9
font_02_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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