Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc19b1626472fe89…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 06:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b336d04aecc38ba3bba08edf12008045 SHA-1: a40830aa00597b93ab250b1b694b6ef6a81080ee SHA-256: cc19b1626472fe89566f3f0d51266dd5bae9b269095f609362e2d42306a0bfc3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+much+does+international+priority+mail+cost
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/wegavemera.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6017d08896c73.pdf
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/7714038.pdf
    • https://sebimifovuduga.weebly.com/uploads/1/3/5/2/135298708/8642562.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5fd8244499328.pdf
    • https://static.s123-cdn-static.com/uploads/4476751/normal_6000bccf838ac.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/d541d.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_601c752d61902.pdf
    • https://cdn-cms.f-static.net/uploads/4475739/normal_601de9a874e0a.pdf
    • http://sovisuxabubete.22web.org/92285197586.pdf
    • https://wuvekodufunat.weebly.com/uploads/1/3/5/2/135298648/dorimiloledewi_mezizalakesofo_mibomuligakit_welafafadofegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_4006f56515c146559f1a9a43fdd39537.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_2dc1cb681778470db71037d6055da858.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_edacfc3b029e4e2db5bdf4c8faee0de8.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_bef96a490d94472aa15c0cf198510d97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51371852-47fc-44df-81a8-922a26482737/kelaxilarirusowukifamow.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_4d9563dd339340e39cce7924d09b3fc7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c15f11c7-f58c-4bb0-b577-6a2f82a96c9d/robertshaw_thermostat_heater_not_working.pdf
    • https://uploads.strikinglycdn.com/files/ba31568d-a0c2-45ca-b32f-7e6661b75649/poulan_pro_pp4218a_replacement_parts.pdf
    • https://7648721b-06f4-4917-9c2a-921156fbbd07.filesusr.com/ugd/a7266c_684c89e2e4cd4a7abce607ed81c2b2c2.pdf?index=true
    • http://zisenapigu.epizy.com/essentials_of_understanding_psychology_loose_leaf_13th_edition.pdf
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_0364e2410fbd4df8be70def906a242f8.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_48fa992828ca4efc90a0662eaf7bccb8.pdf?index=true
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_f592e06352824f2ebbb37e222876305e.pdf?index=true
    • 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_off0000f383.bin
b9304e3001d47a89a6cf9934dad3fced5e3034b0899001a0534a1ba63c5e560d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 5468 bytes
font_01_sfnt_off00010604.bin
9c3f37db1e8b7fbbd5aedc8b9f166c6ae12bf1b2ced6fdcec657dcc137270f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 11588 bytes

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