Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1ec0fff9292757…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 21:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba51a7f70872ebf57b483fd0cb53e818 SHA-1: 036768b41cec76ff8545420feb764a559b8ceb13 SHA-256: aa1ec0fff92927571d44b87b41376dcb0bd1a32232c2b31ef98ffb65136dc853
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically targeting users with lures related to movie downloads. The embedded URL `https://yafferge.ru/strik?utm_term=3+mousquetaires+film+1993` is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=3+mousquetaires+film+1993 In PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/ae57e83025a7e3.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/Dhdjhhe/44328364969.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/TigdwfT/suntze_art_of_war_narration_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/JhiAGgj/download_formula_car_racing_2020_mod_apk.pdfIn PDF document text
    • http://niwifara.22web.org/prevention_of_atrocities_act_1989.pdfIn PDF document text
    • http://tusalolorow.22web.org/porter_cable_c2002_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ravunovibuxi/fJhaKeH/head_ball_uefa_champions_league.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/sunutiwi_zagowivo.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/ied5hbF/bibejawevovad.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/kotodur/22601422733.pdfIn PDF document text
    • http://dunupilopun.epizy.com/lp_urolithiasis.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/roku_ultra_remote_1_and_2_buttons.pdfIn PDF document text
    • http://libiwozurogufo.rf.gd/kozowomasog.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/casio_g-shock_g-7900-1dr.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/wen_56203i_super_quiet_2000-watt_portable_inverter_generator_with_fuel_shut_off_carb_compliant.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/dajisanuzetasasadariwuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/ielts_writing_band_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/63007407122.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5316 bytes
SHA-256: c006395f69e3a9e1ee7f580861ff328665b73c767e2d2b04931c3463b135c2de
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 11616 bytes
SHA-256: f6db26747bf17993306f24ec51ac48ce63ac37d27cde2afec5fa6d23e2ae4d15

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