Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dc729c0f24ce63…

MALICIOUS

PDF

43.3 KB Authoring application: Smallpdf Desktop First seen: 2020-09-24
MD5: a8214921c6f99e1e6cb189e67a7dbb76 SHA-1: 11d70cfb3633d1d89f172cca8688274fc97afb0f SHA-256: 79dc729c0f24ce63d3117d4f7a435ff4bcd7c6bf211e81e8dd7d9bae7af63277
172 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical finding for a link farm and a machine learning model indicating maliciousness. The document body contains obfuscated text and embedded URLs that point to other PDF files, suggesting a phishing or scam attempt to redirect users to malicious content. The presence of multiple external PDF links strongly indicates a link farm used for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://jordanridgesauces.com/uploads/1/3/0/4/130490151/1c159c3f0e0311c.pdf In PDF document text
    • http://drbrentschillinger.com/uploads/1/3/0/4/130475881/rasoxividudapunol.pdfIn PDF document text
    • http://rowanlestat.com/uploads/1/3/0/6/130604108/mizomefuwu-xupibugu-xotisupexesif-nevaxemoposute.pdfIn PDF document text
    • http://sisstar289.com/uploads/1/3/0/6/130621167/226160d4d7fb3.pdfIn PDF document text
    • http://shardexplorers.com/uploads/1/3/0/2/130271177/130271177.html#cctv+camera+recorder+pro+apkIn PDF document text
    • http://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8 9212 bytes
SHA-256: 2bd0e885b8482ec2b36f9774b7bc9dd33168a1c1961b20fde2703a6f43c6838e
font_01_sfnt_off00006118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 4196 bytes
SHA-256: 16374c43fefb3fb406266acbe16aee7d7122405634c1b68ba02c6c95ae4378ce
font_02_sfnt_off00006da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA1 2176 bytes
SHA-256: 0494931b1f6841e954f1dd319798c9a2e4f1bb87bbed3e4da94cbc7d98b328d6

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