Malicious PDF — malware analysis report

Static analysis result for SHA-256 855768987621de22…

MALICIOUS

PDF

73.8 KB Created: 2021-04-01 14:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 651303aa812260d0a8102c391fbe4112 SHA-1: 7877e5a964a178a63a26d5f86499c458948896cb SHA-256: 855768987621de22f3c3f8a96c605e53b38c4a1e1f7619f52f6ce7fdd61b3579
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one pointing to 'https://lozipotod.ru/award?keyword=ball+mill+liners+pdf', suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=ball+mill+liners+pdf
    • http://linodogeb.scienceontheweb.net/40870020831.pdf
    • http://bixapusaxoxuw.iblogger.org/nucleophilic_aliphatic_substitution_mechanism.pdf
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/daliwopewas-subuwaj-xemuxisisatinu-nagam.pdf
    • http://kowojogu.iblogger.org/japanese_phrasebook_and_dictionary.pdf
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/6593022.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/rogidetuwevaxixiloba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98b2093e-94e8-4ac0-ae18-08dd25d3f1f5/what_is_questionnaire_in_research.pdf
    • https://uploads.strikinglycdn.com/files/beaf45b2-5e57-4411-a6ab-1df1962e635f/craftsman_gt5000_for_sale_craigslist.pdf
    • http://gevapugono.atwebpages.com/learning_french_book.pdf
    • https://uploads.strikinglycdn.com/files/4f6a6ced-7610-4981-a4fe-50b06bb843bc/problemas_de_trigonometria_resueltos_paso_a_paso.pdf
    • https://s3.amazonaws.com/siwixomudit/xepera.pdf
    • https://s3.amazonaws.com/xanunafojuloki/counting_backwards_worksheets_from_20.pdf
    • http://vunodakurawofo.rf.gd/fuvomadi.pdf
    • https://uploads.strikinglycdn.com/files/870803ea-a0bf-419c-abb0-69ac68ca4823/punanirixi.pdf
    • http://tizoraponu.rf.gd/12073365080.pdf
    • https://s3.amazonaws.com/tezofuretejom/chase_cd_rates_5_year.pdf
    • http://bowenadulopusin.rf.gd/arp_spoofing_tutorial.pdf
    • https://s3.amazonaws.com/debiwelof/kibemerezagajevevo.pdf
    • http://vesazunexupeva.epizy.com/catechesi_tradendae_juan_pablo_ii.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_off0000e552.bin
1d31889ec77470f6e361ef463e499026355fd37cd526074455e258ca1c2e3c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5236 bytes
font_01_sfnt_off0000f70a.bin
749ef304ec07aa485b386bfd17da46d4d17d864c67f7fdaa8ce7e4d769a881b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10320 bytes

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