Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0107ddf19cb4cf…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 00:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19741560aec15948d493e2f4b6f339a4 SHA-1: 70dd84553a93bae543a18127f75d1d6b3b809e8a SHA-256: 5a0107ddf19cb4cfcfad1a34f70edee2577c5f958bb4c7d5be14d795a6a942fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The embedded URLs likely serve to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://druttle.ru/wix?keyword=the+skate+park+phet+lab+answers
    • https://kefobisow.weebly.com/uploads/1/3/4/7/134733217/d49b959c89b9.pdf
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/794a170a8f441c4.pdf
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/wiwaro.pdf
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/749fd5fa06e63.pdf
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/wupumidokuwemadup.pdf
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fcc2d862a74d.pdf
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/7916138.pdf
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2b8d63205.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_603920eb9ce23.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_5fd32d175e553.pdf
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/rotakipowuzadane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_4500cd7316874aac93243ba3aef0b132.pdf?index=true
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_50b1e9e599ed48c7a725a98bec1a15a5.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_24d4c19d1c344d648baff6f02aed0d02.pdf?index=true
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_8fb7ec86392e49a9bc54e15a81efc392.pdf?index=true
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_efadc359eaf44e188fe4a1c60e6f1f49.pdf?index=true
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_edfd33304dda494b990e8f33350a5008.pdf?index=true
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_9fdef6db61bb4f569a8a985d99d42b57.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_off0000f4fb.bin
f46e8d90ffb2b3fed38a49ee0a9e8305785dbe0f072d7c07eb845671f7ab8ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 5152 bytes
font_01_sfnt_off00010683.bin
9fbeed5c04372388290c541b62912964836bdd5fed586d59878410e921a33d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 11068 bytes

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