Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28efb15249904c5…

MALICIOUS

PDF

91.8 KB Created: 2021-02-18 16:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3cf97d40d76618413669ba521dec8bc8 SHA-1: 26c58db8280bd1d88c73abca886aabf190561d57 SHA-256: a28efb15249904c53e83e58173220068050249ff091ac7908c1958c89b0ce3ef
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or subdomains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly suggest malicious intent. The document body, though truncated and obfuscated, appears to be a lure related to a movie download, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=rin+tin+tin+dog+movie PDF link annotation
    • https://cdn.sqhk.co/jajotulix/jji5jbJ/road_trip_movie_download_480p.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/ibMieh2/horizon_fitness_centre_stockwell.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/cthfhfc/22548192543.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/hbibgiN/motorcycle_wallpaper_iphone_11_pro_max.pdfIn PDF document text
    • http://bonenipani.22web.org/2019_yearly_calendar_template_word_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/hhypHrz/first_4_words_of_the_declaration_of_independence.pdfIn PDF document text
    • http://xadejidigakezu.iblogger.org/vanamuvawu.pdfIn PDF document text
    • http://pilefubasusuz.iblogger.org/dudaxajavagurebukuki.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/DTm3ih5/87711572292.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/065aaa7ae56405.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/yiavicF/arcade1up_pac_man_costco.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/8b4b754af9919c4.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/mavotoxubemewifu.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/Xhbieii/30794087963.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/vuwirate-sekejoradigakul-pipiribelox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawopigemon.epizy.com/98006054890.pdfIn PDF document text
    • http://pufaperimixalet.epizy.com/74988700237.pdfIn PDF document text
    • http://wawutanow.epizy.com/wpf_binding_string_format_timespan.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/34483081684.pdfIn PDF document text
    • http://favuzokusom.rf.gd/yahoo_email_can_t_attachments.pdfIn PDF document text
    • http://pojitak.epizy.com/mesavasuwe.pdfIn 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_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 4696 bytes
SHA-256: 3007529aa0c325c0be3d6dfab7cc746add2ebfe3e07a766d7504ce6de5f600f6
font_01_sfnt_off00013c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 11320 bytes
SHA-256: 911762469123d97d6200e3d5f9734f8dc50899c722b7914f770751e481849752