Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b905e5c784707e…

MALICIOUS

PDF

37.1 KB Authoring application: Pdftk
MD5: 8af96a193004158c2a2ea5816931738e SHA-1: 65371907880fdb11a93ef2525327aaa9b8b630f4 SHA-256: 16b905e5c784707e16d40287e0769c47bb9d0b4af08b1b7594036a615f3d9802
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, forming a link farm, and is detected by ClamAV as Pdf.Phishing.TtraffRobotInstall. The document body, though partially obfuscated, contains URLs that likely lead to the download of further malicious content, masquerading as a free textbook download. The presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zorozuz.punish-me-for.fun/uploads/2020/01/29/najaroletumub_ruwulodotilo_firamasib.pdf
    • http://mme-martin-jordache.weebly.com/uploads/1/3/0/5/130590393/7616152.pdf
    • http://morgan-lindsey.com/uploads/1/3/0/6/130620793/8463525.pdf
    • http://tandb.net/uploads/1/3/0/6/130639037/8382b79.pdf
    • http://vrkuzbass.online/uploads/2020/01/29/985421.pdf
    • https://safepidonaxovot.weebly.com/uploads/1/3/0/4/130494871/resunik.pdf
    • http://nathaniel-gaynor.com/uploads/1/3/0/2/130291624/375d402e6cad1.pdf
    • http://ssvfcpc.org/uploads/1/3/0/6/130604582/1995606.pdf
    • http://arajasekhar.weebly.com/uploads/1/3/0/6/130640009/vuvusenuteraga_jobibogej_zaxetixufe.pdf
    • http://andyjford.com/uploads/1/3/0/6/130621486/8222397.pdf
    • http://proteus-internetmarketing.com/uploads/1/3/0/2/130272070/f78584345.pdf
    • http://my-battalion.com/uploads/1/3/0/5/130590393/gevol_kisin_romubasitu.pdf
    • http://wesharehk.com/uploads/2020/01/27/b3350e0c56102.pdf
    • http://a-aon.com/uploads/1/3/0/6/130604579/jipetobi.pdf
    • http://socollegiate.com/uploads/1/3/0/6/130621457/vivewidiforaxalefa.pdf
    • http://bestofbaliadelaide.com/uploads/1/3/0/5/130551856/8318048.pdf
    • http://greatmir.ru/uploads/2020/01/28/282503fe1.pdf
    • http://miputt.com/uploads/1/3/0/2/130289279/4382740.pdf
    • http://afaparents.org/uploads/1/3/0/4/130477335/130477335.html#a+first+course+in+database+systems+3rd+edition+pdf+free+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001523.bin
404d62a7382491dd3f81427de3fd6a7b935fa9f54fadebd3695e5364bdc8d25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1523 8128 bytes

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