Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b9249807eee9d0…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 04:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52919295a1b22e6976a99c200d7783e SHA-1: 2b078b39fbd4a3b806774e6568887869d37df777 SHA-256: 76b9249807eee9d0bd70292ebb97e72145ce2652909e491bed5a7f089b62a961
156 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 SEO-optimized and point to various PDF documents, suggesting a link farm or content stuffing tactic. The primary external URI, 'https://xezojetit.ru/aws?utm_term=how+do+i+fix+my+lg+oe+error', is presented in a way that mimics a search result, likely to trick users into visiting a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/aws?utm_term=how+do+i+fix+my+lg+oe+error
    • https://cdn.sqhk.co/rifokinimito/aZjfhha/amazon_prime_movies_august_2020.pdf
    • https://cdn.sqhk.co/feguzuvubut/egd3jjK/notes_from_underground_sparknotes.pdf
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/2827278.pdf
    • http://zavulibalox.mypressonline.com/character_design_template.pdf
    • http://jawixogu.mygamesonline.org/ncert_math_book_class_12_up_board_download.pdf
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/8928653.pdf
    • https://dalivesozugu.weebly.com/uploads/1/3/0/8/130813395/zijitefuboz-rijawabil.pdf
    • https://cdn.sqhk.co/loxinesupiva/erih968/fekafotaxawewofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zumomasugipeno/14_gauge_galvanized_steel_sheet_thickness.pdf
    • https://s3.amazonaws.com/rezugekolaba/wetedisovanuv.pdf
    • https://s3.amazonaws.com/tokafanawa/cult_films_taboo_and_transgression_author_allan_havis_2008.pdf
    • https://s3.amazonaws.com/lusegokaves/38319328345.pdf
    • https://s3.amazonaws.com/lotibabakuj/portal_hepatic_venous_malformation.pdf
    • https://s3.amazonaws.com/fekazudabo/17675490209.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_cf856f02a81c4bd99d982b95559ecc54.pdf?index=true
    • https://s3.amazonaws.com/mesixadelomomo/69871433112.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_ef82eb776dd64f7487c11afbb5f81106.pdf?index=true
    • https://s3.amazonaws.com/paxivogedewilu/juzib.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_4384b51f55cf428cb815adb76c27fcb3.pdf?index=true
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_b84fe56b83824584bebcce65a8ebee88.pdf?index=true
    • https://s3.amazonaws.com/xeponodij/5765053084.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin
0fc54110b9de85d9cbd021bc589edd50de3680c947e6058f3af12ab1a2228891		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5060 bytes
font_01_sfnt_off0000fd19.bin
41ed4356f10321d20ed4e0515d81d34d2e378d8352bfbd5f233527c1423ef9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10436 bytes

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