Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a2aef59792f462…

MALICIOUS

PDF

41.4 KB Authoring application: PDFedit
MD5: fc1d1dc2c086f995dcc18aabedc884e3 SHA-1: e6cc2085ed874507eb516cfaacec39b42de7d36d SHA-256: 95a2aef59792f46215b4d113c475de90ca5af2898a28382a7f8efcdffd920fbe
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic PDF_SEO_LINK_FARM specifically identifies the mass linking behavior. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://03stroy.ru/uploads/2020/01/27/b14cbb012891.pdf
    • http://soil-solve.com/uploads/1/3/0/5/130588492/kolanuxewutibo.pdf
    • https://wiwubuvevajeje.weebly.com/uploads/1/3/0/2/130287284/9472605.pdf
    • http://larsonartgallery.com/uploads/1/3/0/2/130274304/7193554.pdf
    • http://readersenvy.com/uploads/1/3/0/2/130291623/wawibe-lofefijilir-kipuxowivuxi.pdf
    • https://disudezigamap.weebly.com/uploads/1/3/0/5/130541351/2996177.pdf
    • https://noguzapamuvap.weebly.com/uploads/1/3/0/5/130551270/2929381.pdf
    • http://meraglimholdings.com/uploads/1/3/0/6/130604625/koriratotu_vumapudekuvijut_nusumosekopeji_kukuv.pdf
    • http://blaine-y.icu/uploads/2020/01/27/borekadezuli.pdf
    • http://feduda.rol30.ru/uploads/2020/01/27/04951d4.pdf
    • http://migearup.org/uploads/1/3/0/5/130539311/7942827.pdf
    • http://cat.satcomarca.com/uploads/1/3/0/4/130476065/7229441.pdf
    • http://otuextn.weebly.com/uploads/1/3/0/6/130604581/5790907.pdf
    • http://noju.remont-s.icu/uploads/2020/01/28/8202d598f7964.pdf
    • http://molecularsupplements.com/uploads/1/3/0/6/130622073/2857138.pdf
    • http://psychicmoonreadings.com/uploads/1/3/0/2/130271177/9943568.pdf
    • http://mylifeinconchas.com/uploads/1/3/0/4/130488993/e5ffd3892.pdf
    • http://riversidecountyhistory.org/uploads/1/3/0/6/130621036/130621036.html#baby+g+shock+manual+5000

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001660.bin
2b60f115637b4a3b565149a91280ca45087e1ed0f49fb6e4b261ec9ac1c6e3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1660 8852 bytes

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