Malicious PDF — malware analysis report

Static analysis result for SHA-256 d278656f10d136b5…

MALICIOUS

PDF

70.3 KB Created: 2021-03-05 09:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5b4cfb8ac5416f6cc8515f2dc3a5ae SHA-1: 3f28fef6a3562f96a77cd31132416bcdda67f62c SHA-256: d278656f10d136b5dfd54b01073965606d2bcde22a9b2f2b3030e86a58e85f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents. The primary malicious URL, 'https://bologen.ru/wix?keyword=the+ffa+emblem+is+composed+of', is likely intended to redirect the user to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/wix?keyword=the+ffa+emblem+is+composed+of
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/vepikikalim.pdf
    • https://jejaxeka.weebly.com/uploads/1/3/0/7/130739175/5867c1c6db.pdf
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/dudujaxako.pdf
    • http://niludop.22web.org/darozumizu.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/87b93d4f15265c.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/f7983c461192bfd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajonubinomeder/twitter_apk_for_blackberry.pdf
    • https://uploads.strikinglycdn.com/files/6ba26633-e593-4da2-8512-21f0b2d9f23f/ancient_greek_government_interesting_facts.pdf
    • https://uploads.strikinglycdn.com/files/e00e4f4f-d0ba-4d8b-8525-77bb993f52e1/sample_ap_biology_lab_report.pdf
    • https://uploads.strikinglycdn.com/files/32e9990b-aef7-4d71-8e20-a99d94197260/timex_ironman_indiglo_set_time.pdf
    • https://uploads.strikinglycdn.com/files/9a07ec89-769b-4912-ac1c-9e4b825a030f/tuvojafazovi.pdf
    • http://jurigixa.rf.gd/bristol_county_ground_weather_report.pdf
    • https://uploads.strikinglycdn.com/files/588860d3-f42e-4c9a-9262-1e9d8c8508fc/gopilalivagenifarunorez.pdf
    • https://uploads.strikinglycdn.com/files/339bb3e5-d2e2-4750-9e67-bf994a919006/wevefadogafum.pdf
    • https://s3.amazonaws.com/xixonu/preeclampsia_cenetec.pdf
    • https://s3.amazonaws.com/xomudufe/cbse_result_2019_class_10_marksheet.pdf
    • https://s3.amazonaws.com/patotale/web_designing_course_notes.pdf
    • https://uploads.strikinglycdn.com/files/0b199ac5-a70e-4014-8c8d-dbeefbb6db86/54133828314.pdf
    • https://s3.amazonaws.com/goneduzum/answers_in_genesis_vbs_2018_music.pdf
    • https://uploads.strikinglycdn.com/files/c89560da-84e8-4b90-96b4-b61c1ba4ad44/how_to_assemble_pack_and_play_bassinet.pdf
    • https://s3.amazonaws.com/tuxexi/5302398569.pdf
    • https://s3.amazonaws.com/fokapikow/rixijegadarame.pdf
    • http://dokelegusipodi.epizy.com/leica_m3_serial_number_guide.pdf
    • https://uploads.strikinglycdn.com/files/b36781a0-8cd3-4a5d-9d2d-90b62fc1f1e5/weecke_fenix_2.0_review.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_off0000d7fd.bin
aa01978fea71cd44ec2474f8c43b159cd8b1d43da684bd66298c33a0bd326818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 5388 bytes
font_01_sfnt_off0000ea24.bin
cbd446b065896450cbf0e927638f9269377b9c8bc07a15be7d1d90471403a86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 9848 bytes

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