Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bfde099cdcffe0…

MALICIOUS

PDF

85.1 KB Created: 2021-03-12 21:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1826358b935b9153265cbc0b90f49f0b SHA-1: 41f664cd2b723b167d216739b340f9d38698370c SHA-256: e1bfde099cdcffe0971c532facd7de368dbe712e5fbc6517679b420e6b7ab044
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, indicating it functions as a link farm. The presence of multiple disposable hosting domains and a high number of links per host suggests a potential SEO manipulation or phishing scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/award?keyword=seven+stages+of+love+book+pdf PDF link annotation
    • https://cdn.sqhk.co/kosojilufut/hhH3Nri/red_sunset_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/fIT1aOc/i_m_gonna_be_dead_someday.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/jixhihi/1446335312.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/jeijgic/61798802821.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/GPgdeSd/wizened_definition_in_a_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/8S5Ojaf/giganijezipaworitojapug.pdfIn PDF document text
    • http://pomevufe.22web.org/samsung_55_inch_4k_uhd_smart_tv_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/ihjbnic/widomikaxivepepilamid.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/ibj4Nen/android_car_radio_bluetooth_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/c7hh4gi/zififolisimonukel.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/ca243034-caec-45a8-b2a9-eabd55c4e6f4/37106591368.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_4562859ff89940be8e11354763eaca67.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_7893a0fbeb854056b32576b8c8eff86f.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_2d6a9500036c4a40879c0d2fc5dfc97e.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_70ada05726684b26bf7584a8aa046af2.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_4ab2b50c3d1347b897035be9a16a49fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a686cf12-8dcd-413a-bd76-31d2284c8298/dunkin_donuts_wake_up_wrap_sausage_calories.pdfIn PDF document text
    • http://felepav.epizy.com/fukolapuvulalaxinabe.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_96dafb4830384cb58a65402871ac70ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd2ec21-d0d9-4d47-8be7-e6ab7539a1e4/tetedefig.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_2d963d707a414fd0bd721c248c90b234.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_4b7395642c58407e91fa3962a9e6e1e7.pdf?index=trueIn PDF document text
    • http://tuwafexom.epizy.com/52383290150.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_669f4571685045f2aaf509ccdf2731a4.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_9f9ce6eecba84a039ea260276668486a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 5480 bytes
SHA-256: 8e187987c58764fc2ddb07bfeb46946b25ba378ce9ae5ae6d60b4602f592f58f
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10732 bytes
SHA-256: c1ef1c8c14c08beea2e6caa60483d24c883095aeab0245f350fd2df23bdf8212