Malicious PDF — malware analysis report

Static analysis result for SHA-256 2816c8b4aab69600…

MALICIOUS

PDF

80.9 KB Created: 2021-05-12 18:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 54c225cc05c7cc8e4a5bd88f1e4e24c3 SHA-1: 9db6afdec85ce438f1fae3f1845dc82220adb252 SHA-256: 2816c8b4aab69600a9714c582416c28b6e7cd140901c03d3f7dd74819b28eecd
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and uses a 'link farm' technique to disguise its malicious intent. The document body, though heavily obfuscated, appears to be a lure for movie downloads, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=love+story+telugu+movie+download+movierulz PDF link annotation
    • http://noksipals.online/hp_elitebook_8440p_charger_price_in_pakistan26qq6.pdfIn PDF document text
    • http://raifaisentgo.online/chaos_of_the_starsev6wi.pdfIn PDF document text
    • http://tdsevsvet.ru/dr._richard_olree_on_minerals_for_thw6lzb.pdfIn PDF document text
    • http://mainsale.info/11364198557nitmd.pdfIn PDF document text
    • http://nogixif.iblogger.org/calendario_365._es_2020.pdfIn PDF document text
    • http://canonsburglake.org/practice_haploid_vs_diploid_worksheet_answerseaxgm.pdfIn PDF document text
    • http://olipaka.xyz/nomaridurozohnql.pdfIn PDF document text
    • http://poverkavoda.website/potepexokufimuzufeva1nege.pdfIn PDF document text
    • http://info-pages.ru/3760908159342uqv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/796f55ec-9f26-4e94-80df-b1f276f7265f/flysky_fs-gt3c_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21684700-a998-4222-ae38-a62d3c29edb5/ukulele_music_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a709f72-ccd6-4f7d-be9e-4b5434c401a7/when_did_tom_daley_marry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb6b521-fb7d-4130-b110-354a948a08ef/the_witcher_books_hardcover_set.pdfIn PDF document text
    • http://towilisok.epizy.com/47611899350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e9cedd-e160-4549-86e8-b6098c5356b0/serokalupulinor.pdfIn PDF document text
    • http://nimozan.epizy.com/akashaganga_2_songs.pdfIn PDF document text
    • http://bipipofagikoma.rf.gd/bossa_nova_guitar_rhythm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285014d5-88ff-4f7c-9e08-6c74582ac3b7/what_size_tires_fit_a_2007_honda_accord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a3ad94-9cb3-4ddc-8d4c-05b457de39ea/xenesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9967f8-0ded-4182-b3d0-4cf566d97b9c/41949196546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4a4d5e-5b82-4dd6-ae61-8c39a851153c/jajezituginejisawege.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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 5388 bytes
SHA-256: 97b17e8194c06ac7f4cf8f8d7a039384dc0744357f65ffc4afb41a1cc0b6fc1d
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 11224 bytes
SHA-256: 31ed42b9a429836b4654cf3feadd98d8be23c33dae34df2182871c30f72859ae

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