Malicious PDF — malware analysis report

Static analysis result for SHA-256 f817df49f25792b8…

MALICIOUS

PDF

82.9 KB Created: 2021-06-09 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5ba3b520ec3d1951c872d265608d7abf SHA-1: 2003f199a2255f07f34caa526ccc1378269d29a6 SHA-256: f817df49f25792b87b7b9e64dc8150e982b76c41da1ec0e79570da0f3cf45713
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. One heuristic specifically mentions 'powershell_version_5_download.pdf' and a URL on 'strikingly', indicating a potential attempt to trick users into downloading and executing a PowerShell script. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://coretry.ru/pbw?utm_term=justin+bieber+changes+album+zip PDF link annotation
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/bitezaxa.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/gusopakanoti_memalurabubuva_folorop_fasulana.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490127/normal_60b28cb6af66e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_5fca07d751de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_606e52119c25f.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/ff5b7a.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/0f048ae39.pdfIn PDF document text
    • https://ruwofemenir.weebly.com/uploads/1/3/4/0/134040866/3218531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_606a75be6360a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_60bce2c83bc24.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/fe997.pdfIn PDF document text
    • https://siwelarip.weebly.com/uploads/1/3/4/6/134682307/3e26773a69436c.pdfIn PDF document text
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/d0758b1.pdfIn PDF document text
    • https://jawozararo.weebly.com/uploads/1/3/5/9/135964334/2190435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fcc03fc5f420.pdfIn PDF document text
    • https://uploads.strikinglyIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/535e1d59-9663-454c-8988-3dc16840ce06/windows_server_2012_r2_powershell_version_5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51afaa8b-6104-4aa1-945b-afa47329cb69/calculate_the_force_of_earths_gravity_on_a_spacecraft_2_earth_radii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d31f6bc-1985-41a0-bec9-531bdc8a9fad/is_the_dmv_open_without_appointment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1ca3e1-7e45-43f0-a5e4-cfe302e25003/introduction_to_probability_and_statistics_milton_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d65ce7-f9f8-496f-9902-3f7eb5ba0b7b/53036820210.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_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 5524 bytes
SHA-256: 92d0f1d53724fd281683ebac7317754d11da6bf67c9476658f2aaf0d3d90b397
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 14652 bytes
SHA-256: d70b3ee7c12339521c3f76a84524f8dff44c20f93886f43791908a4d9f065bfa

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