Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f91fbd6049d88b…

MALICIOUS

PDF

52.5 KB Authoring application: Poppler-utils
MD5: e21e162a4630f33172f01b0733ad0b70 SHA-1: 0daaf1d4b5524ef39b123f6b42c6b37776c46f08 SHA-256: 21f91fbd6049d88bbd5e48d750260d0114d4b99ebf3a9434e7c016763f056d81
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and a machine learning classifier gave a high confidence score. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of 31 external PDF links, with the first being http://surlepouceonline.com/uploads/1/3/0/7/130738615/6523289.pdf. This suggests the document is designed to lure users to a network of linked malicious sites.

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://surlepouceonline.com/uploads/1/3/0/7/130738615/6523289.pdf
    • http://lexanimi.com/uploads/1/3/0/2/130288533/kilepumof.pdf
    • http://scottpreciousmetal.scottpreciousmetals.com/uploads/1/3/0/6/130621456/deae3a2d01b93e2.pdf
    • http://rc-vc.com/uploads/1/3/0/8/130874416/b1c7a1f4e3a504b.pdf
    • http://pinkysgotpurses.com/uploads/1/3/0/6/130639613/5926408.pdf
    • http://itbuilddocs.com/uploads/1/3/0/6/130604233/nanukugepobiwug-mipuzisewoduxig-zavaxowexavimo-wisetovuzu.pdf
    • http://ivjournal.org/uploads/1/3/0/6/130639308/88e4f95.pdf
    • http://atlasnovack.com/uploads/1/3/0/2/130274151/fc49a1b8561cfa5.pdf
    • http://privetst.com/uploads/1/3/0/4/130435982/tesiz-fubekinidifu.pdf
    • http://webmail.ngabwe.com/uploads/1/3/0/5/130541944/da1b0faf1cc.pdf
    • http://mpbanners.com.au/uploads/1/3/0/4/130488698/b2dcd342375d83.pdf
    • http://www.rust-amsterdam.com/uploads/1/3/0/7/130775087/boduv-wipuvetep-pugala-vonebujulujade.pdf
    • http://regentechnology.com/uploads/1/3/0/5/130589346/6415223.pdf
    • http://yml770.org/uploads/1/3/0/6/130620762/d2c034.pdf
    • http://nanlaird.com/uploads/1/3/0/8/130874009/xoxojutizobofodak.pdf
    • http://pmcpaintingscom.com/uploads/1/3/0/2/130272344/rabonavarodow.pdf
    • http://new.mgh-r.ch/uploads/1/3/0/4/130477346/130477346.html#accents+francais+sur+clavier+anglais

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004387.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4387 16036 bytes
font_01_sfnt_off00005cfb.bin
4ee5a05c1c6c48360bcd75435b7fde8e686d9ebe6f9a08561a067fb8808476d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFB 13784 bytes
font_02_sfnt_off0000830b.bin
d487a313261beedf4b32b23217af8f6bfb657f19949b23ae6e2abc4d221abfc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830B 2948 bytes

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