Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef045366fba1ddc…

MALICIOUS

PDF

122.3 KB Created: 2021-03-15 01:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3ad16f1d731e722b91ae0b1e8c94888d SHA-1: bd52db521c9f6cc000f984c1bcf361785030df59 SHA-256: 4ef045366fba1ddc1fcc1b54100c98b6a1850cffe14cd4c8c7fda3f2ee7907cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=big+apple+coloring+sheet PDF link annotation
    • http://xejevojesinil.22web.org/zakadukupojonugaj.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/036412393d53c4.pdfIn PDF document text
    • http://vladport.ru/how_to_assemble_graco_pack_n_play_travel_domeg9vgg.pdfIn PDF document text
    • http://copyright-securityx.com/fisewoperowijulewovr2oxo.pdfIn PDF document text
    • http://trend-sales.fun/my_talking_angela_apk_download_for_pch0myb.pdfIn PDF document text
    • http://openlait.pro/wahl_hair_clipper_gift_set8rfn2.pdfIn PDF document text
    • http://uose.xyz/wepoparikesivasipujuvamoxc2hw.pdfIn PDF document text
    • https://xapabareduvan.weebly.com/uploads/1/3/4/3/134395213/lovizilu.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/893f0c.pdfIn PDF document text
    • https://bedaxeribijone.weebly.com/uploads/1/3/2/8/132814155/dozupofof.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/vetuvujana.pdfIn PDF document text
    • http://zagunur.22web.org/jatavotanug.pdfIn PDF document text
    • https://renijekut.weebly.com/uploads/1/3/4/3/134306869/newefebazemu.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/zezub-paxizuti-refosegu-dojijapo.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/8396804.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/191038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_2024d848cb8c4bb593be9056f44d4929.pdf?index=trueIn PDF document text
    • http://zabesawafusoxa.rf.gd/9843581989.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_ffdf9a50a97e4f798a78c8d00a2b1c76.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_01a235703b344354a2569bfcb792bc10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8091a9-386c-4884-8a40-7d8aabae6726/42986849643.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_9265a7f41a114b719115bbf40fc1e749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a33b5c-7496-4088-ae84-2b3c76c42f33/tatalivekizoganegarug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7293b06-7ad3-42b1-865d-74def8836175/how_to_charge_everstart_battery.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFC 5244 bytes
SHA-256: 1b0345271fb2b29d1aa216d16b60c93db6350666b43df123d520de5f0006c9ec
font_01_sfnt_off00019cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC3 8244 bytes
SHA-256: 73970fcc50f93365016b676395705eb0034251c871f30b882d12b61f8a1a5b78
font_02_sfnt_off0001b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3C9 11648 bytes
SHA-256: d713b43ef6c45af81b721019b94673f1b12b521ec0c59382d95d387a7912d396

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