Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed522b3726568d59…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 15:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48153bf12b5fe829d07c26fed37e528 SHA-1: d9e334839511c0fda911068f4af01ddebe342e99 SHA-256: ed522b3726568d5906308db412c4fc58cdd369389a728faa17542220d1f3f774
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution campaign, masquerading as a worksheet answer key. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/wix?keyword=unit+stoichiometry+mole+mole+calculations+worksheet+1+answer+key
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/1639038.pdf
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/xafiviwubiwaleto.pdf
    • http://movizopolu.medianewsonline.com/lonokaropuruvaguj.pdf
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/4f3dcc0c8f824.pdf
    • https://cdn-cms.f-static.net/uploads/4413236/normal_6019911dcc51d.pdf
    • https://cdn-cms.f-static.net/uploads/4374847/normal_600b8c75d6f6b.pdf
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6047f6d1200df.pdf
    • http://sakulog.sportsontheweb.net/audiocodes_mp-114_manual.pdf
    • http://lafutib.sportsontheweb.net/accounting_rate_of_return.pdf
    • http://mopewogubit.getenjoyment.net/buku_agama_islam_kelas_11_kurikulum_2020_penerbit_erlangga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leteraxewe/what_to_give_your_godchild_for_christmas.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_5578c3849187437583c48aacb1491ac8.pdf?index=true
    • https://s3.amazonaws.com/daniwodug/20974977179.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_39affef737864adea050422480c34546.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/xbox_one_controller_pc_driver_windows_7.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_34c2dd4fc9eb417796a3b9e083e2a1f5.pdf?index=true
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_ce2f0de15200474a9a85aa109bfa62c5.pdf?index=true
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_ebb4b403cf8347ab83a9606a796dc0c6.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_e77be272dd5741d3bc976377896f95f4.pdf?index=true
    • https://s3.amazonaws.com/dowesitobuga/51306385668.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_f58ae353de6c4279848f5c27a130b0ae.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b3.bin
b1e70c6c5ff18ea4be0b72a00c3559f9db13d6ec9c7977042cdbf8681d383e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5340 bytes
font_01_sfnt_off000104cf.bin
539d07241d426880bb50b0eaebde426f5e1b9be3fe7336e91f6d0d44de759a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 11112 bytes

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