Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce87fc79d31da181…

MALICIOUS

PDF

143.7 KB Created: 2021-03-29 04:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0804b0b74fd6917cc509af5b453ef2e1 SHA-1: d767bffb6e9feb5e3694b62a53112e9e8afb1bc5 SHA-256: ce87fc79d31da1811687383a9c889d240b7e94c70c6829298abe0d9a13328b57
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a link farm. One of the primary external links points to a domain associated with potentially malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam.

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-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://golowaki.ru/award?keyword=bed+bath+and+beyond+registry+checklist+pdf
    • https://cdn-cms.f-static.net/uploads/4407784/normal_604a3beaeda02.pdf
    • http://tacfitproducts.com/kidde_carbon_monoxide_alarm_kn-cob-b_keeps_beepingg56os.pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_603e46f6be136.pdf
    • http://ersoil.fun/18198319979ii2ip.pdf
    • https://fagesuxolibedif.weebly.com/uploads/1/3/0/9/130969327/gajefukabeda-xotamezikizil-wokorokolul.pdf
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fed2dee4fe99.pdf
    • http://copyrightproblem.com/fufonediji8s886.pdf
    • http://xoxinusenavi.66ghz.com/wubusiful.pdf
    • http://legalvictory.group/how_many_amps_is_a_batteryo2tey.pdf
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/9ed9ea8e7b9e9.pdf
    • http://adanakebap.org/fluval_305_external_filter_instructionsazpk0.pdf
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fdf2fed8d533.pdf
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/ketufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ded30e3-28ab-4986-bbc8-2f910a12298e/nexus_geo_release_date.pdf
    • https://uploads.strikinglycdn.com/files/59b11f95-d6c4-4f8d-9b48-5f242aae3c51/cutting_for_stone.pdf
    • https://uploads.strikinglycdn.com/files/b8d783d5-63d2-4bdf-9233-72398a4ca7bc/how_to_change_hp_deskjet_2652_ink.pdf
    • https://uploads.strikinglycdn.com/files/5e3ce092-4871-4d73-9ea0-1ffbaa8c6ba0/stephenie_meyer_new_twilight_book_jacob_and_renesmee.pdf
    • https://uploads.strikinglycdn.com/files/82b3899c-46b9-4213-aea7-8484356a8365/5_ejemplos_de_verbos_irregulares_en_ingles_y_espaol.pdf
    • http://goviragukipi.epizy.com/nonowos.pdf
    • http://golofup.rf.gd/aristteles_livros.pdf
    • http://fujatelet.epizy.com/shakespeare_sonnet_meaning.pdf
    • https://uploads.strikinglycdn.com/files/c4c6f569-dd17-4687-a79a-a00726326abd/52245278828.pdf
    • https://uploads.strikinglycdn.com/files/4e02914d-d324-4252-9dc8-abd6d6708545/riredupesikixoje.pdf
    • https://uploads.strikinglycdn.com/files/336b1bc6-7b03-409d-b215-3d7d675d04d2/42944330250.pdf
    • https://uploads.strikinglycdn.com/files/111dd652-60aa-4fa8-8004-59c1b4803f42/architectural_graphic_standards_7th_edition_free_download.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_off0001f45b.bin
7a39fd6fd1b3bf72e72cf9fed9628369f29b981650f6f4d3ccb9f55de60ea91c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F45B 5772 bytes
font_01_sfnt_off0002080a.bin
170ad9d56033c82b509de24cb955a2ab497920dddd79f1609e7a7a57325b1a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2080A 12044 bytes

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