Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd76948e30bcd4…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 02:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b288858e9c3c6655dd218e2febe61832 SHA-1: fdbb26faafa390cfc1a80a41d03ce10e176a99a8 SHA-256: 28bd76948e30bcd469a008b837fc07c7b735779c5e7b523fc2f00c1fe5fac3db
214 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link to dafemum.ru and a PDF link farm containing numerous external PDF links. The ML classifier also strongly indicated maliciousness. These findings suggest the PDF is designed to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=conclusion+of+volcanic+eruption+experiment In PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe0a5f621d3e.pdfIn PDF document text
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/monabavurabog_zopopu_pibejenakoposu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60104b5d961f2.pdfIn PDF document text
    • http://zelijek.iblogger.org/koboxatojaravupuzebegi.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/46106960770.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/67691275327.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/tabla_periodica_con_grupos_y_periodos.pdfIn PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/6584969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5fc9a44291e80.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/pefaput.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/56723549143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/safety_1st_alpha_omega_elite_air_car_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/70799694483.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/93279437126.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/briggs_and_stratton_625e_series_190cc_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/hiv_guideline_2018_thai.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/which_of_the_following_communication_media_tends_to_be_the_best_for_transmitting_emotions.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/verbos_regulares_en_ingles_y_su_pasado_simple.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5192 bytes
SHA-256: 38d67ec0b8fdf78e0e6a7551ef6c52d5ed17e706bd304d97404fcf32010869aa
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 11460 bytes
SHA-256: 3db292d58c428cf3d3aa8fda1d8a1c7c3ec431302a799724672c4d50505e24c3

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