Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2b8e5703271554…

MALICIOUS

PDF

76.8 KB Created: 2021-04-26 02:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 393833ce0a8f457f201e9063e53b318d SHA-1: dc9286d76785af8bd8edd9bc099f36a6acc82e95 SHA-256: aa2b8e57032715541ce48f18b0c30d2304b13e1d707453a78ff30c2b9108e999
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=the+secret+garden+release+date+australia PDF link annotation
    • https://cdn.sqhk.co/kasunelebak/XdUigjb/cultist_tft_spatula_item.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/1573454.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/ghDGujd/zodasesetaru.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/hjiggjb/flat_card_template.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/VdAphfI/weduxexisaluxunugokole.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/7684102.pdfIn PDF document text
    • http://dalkomis.website/begolipafupe0jpvy.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/6647018.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/eeifZ2O/list_of_1970s_hard_rock_music_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_603fe8a283163.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/jhhfgfw/90s_dance_music_female_singer.pdfIn PDF document text
    • http://technodom11.com/richard_iii_shakespeare_downloadnu94r.pdfIn PDF document text
    • http://sunshop.pro/hill_climb_racing_2_hack_partsgknvb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_5fd61aec32a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/ekjhhi2/42956520259.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/1155410.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/wizufulafo4j3j3.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/jb9DKpB/10468547562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_f68235441782403d8dcad49094908dfa.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_d2c832c8b9444162a8b3209059a04c4d.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_c472a0c2bbca442c8eb8ac75238ddf03.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_a5478911d1a0473fb86f7b3318cca9f0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5152 bytes
SHA-256: 5c4ac8fe648b15e500fc42b43c04db6d90a0666c6aa51c0f5faa3951f313de8b
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 11204 bytes
SHA-256: f8f0df398b3424753fd6031101af591b7ed685178ddde2c1930882fd53379729