Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e240ab120be23d…

MALICIOUS

PDF

50.5 KB Authoring application: pdf-parser
MD5: c4b9ec58155b85dc73526a1bc13ac10e SHA-1: 6aa88da5dc9d608ef460a80666e2bca4255d371e SHA-256: 76e240ab120be23d41dbd8d25169013aad0917edd3691dbc8a50a7bb2b45ce47
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique commonly used for SEO poisoning and phishing. The document body, though partially corrupted, suggests a lure related to downloading religious texts, which is then used to mask the malicious intent of directing users to download further malicious PDFs. The ClamAV detection and ML classifier strongly indicate maliciousness.

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://nwcbuildingservices.com/uploads/1/3/0/2/130271167/setez.pdf
    • http://laughingduck.org/uploads/1/3/0/7/130776885/rasot.pdf
    • http://office-supp.com/uploads/1/3/0/5/130588712/2388149.pdf
    • http://comfycabinfamily.com/uploads/1/3/0/3/130312983/2f3d5f7124c13e7.pdf
    • http://shrewsburycondo.com/uploads/1/3/0/2/130292173/zibutifadelo.pdf
    • http://nickyarthur.com.au/uploads/1/3/0/4/130435503/3747757.pdf
    • http://lloydstreeter.com/uploads/1/3/0/7/130739886/8721778.pdf
    • http://waylessepoxyflooring.com/uploads/1/3/0/5/130589219/060a849f.pdf
    • http://mybiohelp.com/uploads/1/3/0/6/130620173/3422200.pdf
    • http://beyondhillco.com/uploads/1/3/0/4/130476203/130476203.html#download+surah+yaseen+pdf+in+english

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011e3.bin
daac483b14a046788b989011a76e3b7fea2840bffc61674584230bcc5ee2c3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3 8360 bytes
font_01_sfnt_off00007fe8.bin
ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE8 16028 bytes

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