Malicious PDF — malware analysis report

Static analysis result for SHA-256 145fb5de1bbef2f5…

MALICIOUS

PDF

41.5 KB Authoring application: PDFedit
MD5: 5230e5aaba74c89ba62e6176ba362f0b SHA-1: e1bc499814cf2dc8145d5d8bf550b5f74b061222 SHA-256: 145fb5de1bbef2f54066d0598a23441ca010a34f2ac8b3b854d3dabd7c3e5f31
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files hosted on various domains, indicating a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gevaladexadiv.weebly.com/uploads/1/3/0/4/130435602/4839128.pdf
    • http://savamaso.texdom64.ru/uploads/2020/01/28/eec04e5438971.pdf
    • http://kissmygritscafe.com/uploads/1/3/0/5/130543640/nulezakekomuponurafo.pdf
    • http://boniluses.prorealgame.ru/uploads/2020/01/29/683027.pdf
    • http://koto.restavratsiya.com/uploads/2020/01/28/478997.pdf
    • http://vajudo.pp-offer.fun/uploads/2020/01/29/192cb277f9.pdf
    • http://weniguli.masterpechi.ru/uploads/2020/01/27/9837825.pdf
    • http://witi.americanadeidiomas.com/uploads/2020/01/28/fexit_toviziz.pdf
    • http://topezam.multiclimat.ru/uploads/2020/01/27/7409970.pdf
    • https://xopobilug.weebly.com/uploads/1/3/0/2/130272573/nomol.pdf
    • http://magicaladventurestravelbystacy.com/uploads/1/3/0/5/130544386/3952385.pdf
    • http://xafu.speacetech.us/uploads/2020/01/28/wozevin.pdf
    • http://anteroproducts.com/uploads/1/3/0/4/130476242/130476242.html#el+desayuno+de+laura
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000130d.bin
c16a0ac4a13b60c4218c2beb6c031bafd6779b34e18c4d9a76999a90e60636db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D 9336 bytes
font_01_sfnt_off00005b40.bin
bb7f3a77f7833b39fe6b0cf08265a5ad0460cb4bda91382e6c877c0db3ce514d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B40 16164 bytes

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