Malicious PDF — malware analysis report

Static analysis result for SHA-256 1376ff8b1150c0fa…

MALICIOUS

PDF

36.1 KB Authoring application: Smallpdf Desktop
MD5: dce829f72b0b8967426e8408da9511f2 SHA-1: eeb687d2c1581cc2c005e640842014be9b5d4f7e SHA-256: 1376ff8b1150c0fa5bb3755a0fddd14436f6c3f0a6cdf8ea283b3df2eef84a67
152 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, also contains these links, suggesting a phishing or SEO spamming campaign. No scripts were extracted, but the presence of numerous external links indicates a potential for redirection to malicious sites or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nadeko.org/uploads/1/3/0/3/130379104/zimofatifowedonik.pdf
    • http://renova-skin.com/uploads/1/3/0/6/130603764/rukujejojana.pdf
    • http://desatascosmolletdelvalles.com/uploads/1/3/0/4/130476766/1063580.pdf
    • http://mycpfc.net/uploads/1/3/0/3/130323642/d5c700.pdf
    • http://midwestasphaltandgravels.com/uploads/1/3/0/4/130476691/pomasovugeg-faminejuriris.pdf
    • http://juantaborda.com/uploads/1/3/0/2/130287318/gezeropezixajex.pdf
    • http://norcalpomskies.com/uploads/1/3/0/7/130738662/misutojene.pdf
    • http://mountyhorseandsports.com/uploads/1/3/0/4/130436357/jagetuwedate.pdf
    • http://misssoutheastpageantry.us/uploads/1/3/0/7/130740622/130740622.html#past+perfect+continuous+tense+exercises+multiple+choice

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011ae.bin
6062d05f861045b925af2d0cbdcfe5404f4b5400d33b1419dd97b2576ae31d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE 8188 bytes

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