Malicious PDF — malware analysis report

Static analysis result for SHA-256 7414767be6bdb471…

MALICIOUS

PDF

110.2 KB Created: 2021-03-27 11:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 08560fa730cccb7b752a1ea87bf5e54e SHA-1: 11ba80fc657af77e5b7db6b25c0c9fd9adc97524 SHA-256: 7414767be6bdb4716f1cd1b0511005eeefafcfc18b86647767c6f8032c5062c1
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious workflow, possibly involving JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • 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://baarspo.ru/award?keyword=human+biology+book+pdf+download PDF link annotation
    • http://e-sparks.ru/the_lion_and_the_mouse_book_onlinedykms.pdfIn PDF document text
    • http://laithub.pro/84876607096o8kgy.pdfIn PDF document text
    • http://2220202.ru/what_things_are_illegal_for_teachers_to_dotue0n.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_605468e320a7e.pdfIn PDF document text
    • http://hookup750.website/kofanenemufuvapefexopepu2mwkt.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/huojiDw/bossmobi_movie_songs.pdfIn PDF document text
    • http://mikrotikwizard.com/73889686819pddd5.pdfIn PDF document text
    • http://vertitribe.store/springfield_87a_scope_mount7243n.pdfIn PDF document text
    • http://help-igcopyright.xyz/cool_icon_pack3lexy.pdfIn PDF document text
    • http://pokemonrivals.online/87339683720xlkzd.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/fjaSiib/70246699761.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/ifha6jg/gowegijirikoro.pdfIn PDF document text
    • http://idealicacolumbia.site/viwofovurapsirg.pdfIn PDF document text
    • https://cdn.sqhk.co/jebixusugak/hagdjfc/65623779342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd29295c0104.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/2jejcEk/barbecue_ribs_restaurant_chicago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_eddce37d5c2846e0af015083b5bcfafa.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_348b3def4c3743d78dcc4b4387266cc0.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_0c6d7e35797141f5bc05c510cbec4649.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_031aff937f874e93bf3b77d7fdec3aea.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_e2e0b17613174941a605ef079795a80d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16696 2828 bytes
SHA-256: 2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553
font_01_sfnt_off0001709f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 5444 bytes
SHA-256: 414faca184dfaf8e576d0b3f7343caca6fd0d185f5d94f4e0ad8401bd47ab86e
font_02_sfnt_off0001832c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1832C 11568 bytes
SHA-256: 176a463d6aecbe48559f9ed2cac4047a6feff54fa6e223ff6e370e1275236afc