Malicious PDF — malware analysis report

Static analysis result for SHA-256 e564c7cba8f1e647…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 05:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4c88fc0b7377edd2e8f21b1538d97e38 SHA-1: 47ab7c3ac520a4b79bfc57d6f4364f6d194d2177 SHA-256: e564c7cba8f1e6474b199c18e8d007d213cbe91cb128ad1824f2a32142c11d06
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a specific book title, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=servsafe+manager+book+6th+edition+pdf PDF link annotation
    • http://biwedujurar.mywebcommunity.org/strong_bible_dictionary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5ffc2b4eb56d9.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/nerepajebofevuzmctw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_604acde888db4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fd04c70c1562.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/vitamix_smoothie_recipes.pdfIn PDF document text
    • http://cardio-natural.info/rexemobtr5id.pdfIn PDF document text
    • http://segwaywheelchair.ru/how_to_use_prestige_oven_thermometer_probeq98zv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_602353c95b637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_601bc94e1d7b2.pdfIn PDF document text
    • http://winoorama.website/how_do_you_convert_julian_dates_in_excel2ugxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fdd70edd3.pdfIn PDF document text
    • http://item-mask.top/10193318757l0yx4.pdfIn PDF document text
    • http://bestcreditcheck.info/58870701547aqcod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_601d5fe49f6f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_6003fe2eb4fb6.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/oxford_biology_dictionary_download.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/5f4e3f68-93dc-4d94-8556-48a224dec257/57175832295.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/hush_little_baby_man_song_meaning.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/fumivibesekug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bdf59b-e36a-425c-bed2-8f4d42d897c3/descargar_biblia_reina_valera_1960_gratis_en_espaol_sin_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4374c1-bec2-4002-9bf1-ae5524b873f0/sex_coloring_book_printable_for_adults.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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 5944 bytes
SHA-256: 219c455b3b385b95767fb680db71d8ca46b42ec2a8dec4f4872d364bd1e66d2a
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10696 bytes
SHA-256: 4ad11125f47430943e678646c974dce6cae0476a7d42505e21ac0506722c4996

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