Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3726ca9e0e0dca…

MALICIOUS

PDF

88.2 KB Created: 2021-03-21 23:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91bf576a1d18be99bd5a9d5c117a2bd1 SHA-1: 821f99370c58605f89f39b9135ad3219bc1a0599 SHA-256: 6d3726ca9e0e0dcabc1c8520d48d24824a332a56c2732b30f2a9b539cb011312
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 0.9995

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/strik?utm_term=la+la+land+epilogue+%2528piano+arrangement%2529 PDF link annotation
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/7357131.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/partidos_politicos_de_estados_unidos.pdfIn PDF document text
    • https://rasogumelix.weebly.com/uploads/1/3/5/4/135400304/fecc71c005df955.pdfIn PDF document text
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/9401449.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/xipepe.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/6898230592.pdfIn PDF document text
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/30927d1d8be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/93267000917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7e9700-bcf6-4fb0-8f89-18c3470fb175/roland_tr8s_v2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71df2aa0-9232-4c79-ac54-9c4439f091d1/what_is_mind_power_secrets.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/rpg_maker_vx_ace_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4ff9f1-6ee7-47a6-bff8-4283c93a43dd/fujitsu_mini_split_red_and_green_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6774f6f9-2438-4178-a439-c02d7dbabdcd/what_does_burning_barn_mean_in_dreams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a37bbc5-3c5e-4eae-9d01-4ac9244cd031/guvumogamawipelaxolo.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/34440792382.pdfIn PDF document text
    • http://dugerem.atwebpages.com/1621783210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30abd8df-1d3e-4106-9c28-c8d6e725c673/55968037611.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/bts_guidelines_asthma_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0acb80-993d-455d-97b8-92e1b4903e81/tunafexodilovuguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fc8828-924a-49ac-a101-e108e359866c/brother_xl2600i_needle_threader.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 7624 bytes
SHA-256: 7ef408fd66e687efcd80c6ff4698e0c4625d0a75d05e8ccf712d576453aa2047
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 5080 bytes
SHA-256: a87f676ff7098d137095a90faea0739f370725fb22a8ceb50f0772b730ed8147
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10844 bytes
SHA-256: 49f6a5a628d4ca1d584787339b3003453f4f2e81ac57bce160e2fadb4ad0e6f2
font_03_sfnt_off0001444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230