Malicious PDF — malware analysis report

Static analysis result for SHA-256 81984e58f45c02e9…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 18:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 851fcc19ed91b8d1e7cfbee8abe60664 SHA-1: 212272c971f32b48b8e63408a752b77c3e46f675 SHA-256: 81984e58f45c02e97376e45e5454bb15d2aeed8c037b392b784c2df400be507e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://jottigo.ru/wix?keyword=foodsaver+v2840+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/foropogajag/jjQjduf/knights_of_columbus_sword_for_sale.pdfIn PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/vunipugakopigipape.pdfIn PDF document text
    • http://zapajewoda.22web.org/39568682712.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/ddgggIE/bojadesafidugu.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/hjIgihf/java_64_bit_windows_10_install.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/sojexaza.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/fggrTge/rubanabojosezedib.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/guLgcgc/55571736203.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/vedijuze_kewodipizu_xejile.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/ji9e8Ek/vivavideo_video_editor_video_maker_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/vtg8hbU/85545653603.pdfIn PDF document text
    • https://lodufokokafapav.weebly.com/uploads/1/3/5/3/135346761/3314207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_4db885b4b0d4431980df366b305e61bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81acb9f-233f-4922-af65-21e6159c7110/42348636695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c259f897-4830-4bd3-ba0d-ffdbb0909822/lujolusefobujekesi.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_ca43c2558318481ab357ce59033515b5.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_e6d4df1d0bf64c918ed85f5544c43982.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_5df42b135dbd4b9796a66e8542f9bf29.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d2fba43c6ca94277beb9c62b8599077e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62536920-2247-4972-a31d-958dc008e036/harry_potter_y_el_prisionero_de_azkaban_20_aniversario.pdfIn PDF document text
    • http://bijalefopate.rf.gd/film_ashabul_kahfi_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398deeed-eec2-418d-bc40-f57ca45f1038/what_are_the_first_100_fry_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2f9d53-b83b-4b4e-9d72-93fd35d48ffe/sony_rx100_vii_price_malaysia.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_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 5796 bytes
SHA-256: c708e76d7fe598d44a1e9474db5f16ac3aeb70cfe55efd2a42d67f0b3c67c759
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 10848 bytes
SHA-256: f41e6a24d1658287755c8dbca8b9c8b2957e25452b4fd15fcd3a1967342bd1f5