Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b390aa267b5785…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 03:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a493a2880a2150654015ccedd6fd9a SHA-1: c8acd621a6fe00e2bfcdb5365641de4c471ae656 SHA-256: f1b390aa267b57859c302b48321dabbedfd4dee0ca2b2c30069e8e3f90475f9a
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 to benign-looking but potentially malicious PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/wix?keyword=auxiliary+verbs+worksheet+pdf
    • https://zakepanitug.weebly.com/uploads/1/3/5/9/135977879/1278438.pdf
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/lorikulesufovovufe.pdf
    • http://limaxinsto.xyz/balanza_de_pagos_peru_2019l9fox.pdf
    • https://xavagozewurele.weebly.com/uploads/1/3/4/5/134583143/4d3e9672.pdf
    • http://jajuviramigawo.medianewsonline.com/pinisivetipise.pdf
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/dejubukoduxasom_jiliguxifa_lopebike.pdf
    • https://lomamunapud.weebly.com/uploads/1/3/5/3/135315780/cb32dd00a4.pdf
    • http://gisujug.mypressonline.com/73729712039.pdf
    • http://bupetud.xyz/zombie_buster_blast_them_allmc58k.pdf
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/getubigi.pdf
    • http://formblckr1.xyz/ford_mustang_ecoboost_price_in_uaemzo79.pdf
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/tidubifuzotirerak.pdf
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/4924844.pdf
    • http://votixibutiro.medianewsonline.com/calculator_program_in_c.pdf
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/2545459.pdf
    • http://juvezupeteduzax.iblogger.org/company_letterhead_template_google_docs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bixuxopot.epizy.com/xamopidoripetam.pdf
    • http://ludekakub.epizy.com/catalogo_natura_2020.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_94d6f2b10dff401fb683c6059b3510b7.pdf?index=true
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_ea0f7e00be7d482eabb86972630406fe.pdf?index=true
    • http://sifebitufol.onlinewebshop.net/98153228696.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_10a6b17894034383bcc20cdef3ea4d86.pdf?index=true
    • http://luzegatujil.epizy.com/nofupin.pdf
    • http://kuxemozoxabonag.onlinewebshop.net/sapumabimufiduletirem.pdf
    • http://birifamabaxum.rf.gd/wrecked_2015_z28_camaro_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24d.bin
8c43879741bdc27df142af7c8873756d662ed5b19584fa33abd2196cc43f25cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 5420 bytes
font_01_sfnt_off0000f4e4.bin
847c4272b4b0430d7afbf26b7b114d99a3830ffcc0538d7c9492621b9bee09d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10760 bytes
font_02_sfnt_off00011940.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 4324 bytes

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