Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf5f8826809195a…

MALICIOUS

PDF

94.5 KB Created: 2021-04-29 17:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52a928369e1675e6bb57893f44c70af5 SHA-1: 105ae5b731109b131ec57ec571345d4b85fefbfb SHA-256: 1cf5f8826809195ad95118d276bef43e5b86e41337b2f9bf0854d50a06ed5187
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=loudest+roblox+id+code+ever PDF link annotation
    • http://copyrightshelpscenters.com/word_flash_cards_templatevczns.pdfIn PDF document text
    • http://alania365.ru/19131467845h22js.pdfIn PDF document text
    • http://roskycnmx.com/70699153658d5jnb.pdfIn PDF document text
    • http://fastcreditcheck.info/firefox_52._9_32_bitbvcoa.pdfIn PDF document text
    • http://dimax.website/maersk_line_bill_of_lading_templaterwa7a.pdfIn PDF document text
    • http://betmoy57.com/xipuw228xk.pdfIn PDF document text
    • http://luchdobro.site/68494485330ks96o.pdfIn PDF document text
    • http://marafonsport.site/walmart_covid_vaccine3afkq.pdfIn PDF document text
    • http://spiritstudio.ru/minecraft_tutorial_world_download_javaxcxmj.pdfIn PDF document text
    • http://gufutaca3.xyz/rii_mini_i8_bluetooth_connection55la6.pdfIn PDF document text
    • http://gouliwer.online/nulovegixifelulinge3ck.pdfIn PDF document text
    • http://shoplus.info/68199673671im66d.pdfIn PDF document text
    • http://sell-toclick.online/80701719967vvg4y.pdfIn PDF document text
    • http://winoorama.fun/gawusuvev60c8u.pdfIn PDF document text
    • http://manybigs.space/xavifaganekadaw2p4s.pdfIn PDF document text
    • http://tokio-2020.fun/88358715689xakea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/212bde23-1507-44f7-a021-4c7e1d5303d5/personal_training_plan_template.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_d347d509f2834a22a5abd206ad23f03c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b30d7d-c937-41c2-a1a5-170c3ede27c4/engineering_circuit_analysis_8th_edition_solution_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a1c40c-c3c4-4b4a-acde-0512127ed078/41552451006.pdfIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_a4d8fe4236a141109e44ba2096125bbc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 4932 bytes
SHA-256: 7603424b765a68b94d8eebbc1b2da27ba80484ff44e53cb497afc075097df1a6
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 13704 bytes
SHA-256: 1e6924884a8ef9fd69176f8b1d5239c7412b3ff703cc93dad5aa1357f02bbb35
font_03_sfnt_off0001573b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573B 16104 bytes
SHA-256: ea2a42892dffc6b9fe7c307268abf3f97fb4907571b9c1207ef1a69fcb01c664