Malicious PDF — malware analysis report

Static analysis result for SHA-256 383f7c090114d2d0…

MALICIOUS

PDF

44.6 KB Authoring application: PDF Studio
MD5: 3a1b7956c7ec63e3c93d0d209e4d09b5 SHA-1: 7e85593b903df83da391a51765a6c4175cdaf41b SHA-256: 383f7c090114d2d0dc1df98719e353073072afc413f4b987d63dc34301285bda
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 pointing to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear user-facing text, but the heuristic firings are sufficient to determine the attack pattern.

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://singbabysing.biz/uploads/1/3/0/7/130775653/gadomapefe.pdf
    • http://monkeywalldecals.net/uploads/1/3/0/6/130639721/likuwixore-dobuwikodem.pdf
    • http://auckair.designpreviewer.com/uploads/1/3/0/6/130604993/a7b14f.pdf
    • http://juliablack.net/uploads/1/3/0/5/130538817/vibow.pdf
    • http://blackcatpictures.org/uploads/1/3/0/5/130588622/9226815.pdf
    • http://www.mountaintopcookies.com/uploads/1/3/0/6/130603905/807da47747b3486.pdf
    • http://minursespac.com/uploads/1/3/0/5/130550994/wujufeka.pdf
    • http://www.drlesterleemd.com/uploads/1/3/0/6/130605230/fakewemupegevuped.pdf
    • http://mymountainstories.com/uploads/1/3/0/7/130739695/4466429.pdf
    • http://kloshe.com/uploads/1/3/0/2/130289265/e014b3.pdf
    • http://cartonioscornerjewls.com/uploads/1/3/0/4/130483096/bupofidaromasub.pdf
    • http://thearchitecturalgardendigest.com/uploads/1/3/0/5/130540208/nugafenevajub-wazuxufi-vifuso-jekuru.pdf
    • http://vertontravelservices.com/uploads/1/3/0/2/130273850/66f3b01.pdf
    • http://boisdarcreations.com/uploads/1/3/0/6/130621477/1810840.pdf
    • http://adsl-63-204-18-34.benefitplans.org/uploads/1/3/0/5/130551206/130551206.html#total+magnification+produced+by+a+compound+microscope+is+20

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003e0a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E0A 16036 bytes
font_01_sfnt_off00005519.bin
c8b543d5cdff0548d05a4ad9a59c59fe0c48b5ba100538f93cb4ae688cd089b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5519 7712 bytes

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