Malicious PDF — malware analysis report

Static analysis result for SHA-256 71890242496df33d…

MALICIOUS

PDF

67.0 KB Created: 2021-03-08 14:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68f9a02cc46937b49a929385c5ef88e6 SHA-1: 39685354fede5735721dbe9db926e35704e0c1f1 SHA-256: 71890242496df33de54ed2cf855454eb42763a1110a7f9c504e67858c7336a6e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. The embedded URL 'https://seumenha.ru/wix?keyword=words+that+start+with+ch' is likely part of this malicious infrastructure.

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
  • 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.
  • 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://seumenha.ru/wix?keyword=words+that+start+with+ch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6032ca4b52851.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/abide_with_me_descant.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/5939301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_60028396f28d8.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/how_to_connect_black_and_decker_battery_charger.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/the_joy_of_sex_book_1972_illustrations_page_46.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/pijelusa-domofubevelip.pdfIn PDF document text
    • http://vofarufumuwe.iblogger.org/jizagosofim.pdfIn PDF document text
    • http://sagipidezipe.22web.org/synonyms_and_antonyms_worksheet_for_class_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvumutat.rf.gd/zuxejodixexatunugijumeduf.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/wavonani.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/cahier_des_charges_outil_informatique.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/bluedio_f2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/canada_visa_family_information_form_signature.pdfIn PDF document text
    • http://tamefizorala.epizy.com/zutakimixarizebelopodal.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/read_theory_analogies_3_level_11_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/cisf_head_constable_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/baahubali_1_video_songs_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/prodigy_autocode_meter_software.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_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 5100 bytes
SHA-256: ab1d503a29e93a48b0f2cbb71863aba04270a46f12d447c0334410f6f7a554bf
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10284 bytes
SHA-256: d2aea61dfd250a89f50c8b4642e16ca13978f25535360e7b569f29b75213ada5

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