Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e514d16ccff2f5…

MALICIOUS

PDF

36.4 KB Authoring application: Mobipocket Creator
MD5: 00a5a96aad83293dd79f75c8f04785d6 SHA-1: 558791a72d29f1ab7c79ecef3a337393d557028a SHA-256: 81e514d16ccff2f5a7c386d9a89821b7f053ffbac27eae7ae1af148e2f41e4e9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, as indicated by the PDF_SEO_LINK_FARM heuristic. These URLs likely lead to malicious content or phishing sites. The ClamAV detection and ML classifier further support the malicious nature of this document. No scripts were extracted from this sample.

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://bespokely.com/uploads/1/3/0/5/130542996/24e616b7ca109be.pdf
    • http://naturesowncharcoal.com/uploads/1/3/0/2/130270845/7893037.pdf
    • http://andrewwarnerdogtraining.com/uploads/1/3/0/2/130270993/4803713.pdf
    • http://jofu.ethereumbanking.org/uploads/2020/01/28/tezuwogomilida-gakifusig-nivon.pdf
    • http://pogegraphicdesign.com/uploads/1/3/0/2/130287883/d5bc5ac2f.pdf
    • http://michelamclaurin.com/uploads/1/3/0/6/130605073/1735b.pdf
    • http://stjohnlutheranruma.com/uploads/1/3/0/6/130604377/07d284aa2654.pdf
    • http://laurielyons.net/uploads/1/3/0/3/130323180/6227131.pdf
    • http://guruofbridge.com/uploads/1/3/0/6/130621450/54b972d253.pdf
    • http://lataco.net/uploads/1/3/0/2/130291523/loxowu-filurulez-gesunodoj-murorunu.pdf
    • http://summit2summitcoaching.com/uploads/1/3/0/7/130738894/rodaxuza_rezejufura.pdf
    • http://pameladirnberger.com/uploads/1/3/0/2/130270879/130270879.html#grammatical+structure+of+second+conditional

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012d6.bin
fe051c421b63c1e5fa4fd6164685e4a712966ba2cff9b4214e378a0b7b7ab2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6 7572 bytes

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