Malicious PDF — malware analysis report

Static analysis result for SHA-256 5813968d613beda2…

MALICIOUS

PDF

43.8 KB Authoring application: Smallpdf Desktop First seen: 2020-09-07
MD5: 822fd61a5dddefef98df2420bd7ccce9 SHA-1: 67478334d3a526c78351524c815f5652d4863315 SHA-256: 5813968d613beda2dc29e5a0d0950177194aa7f5191a7c5f4c9351ee768472fb
192 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF documents, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a phishing or traffic redirection intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://studentsmentalhealth.net/uploads/1/3/0/6/130639183/5933653.pdf In PDF document text
    • http://allaboutalyssam.com/uploads/1/3/0/3/130313454/danumo.pdfIn PDF document text
    • http://2daycashoffer.com/uploads/1/3/0/6/130639062/4246372.pdfIn PDF document text
    • http://tap-folio.com/uploads/1/3/0/6/130604885/rurodefevajilud_riled.pdfIn PDF document text
    • http://rossconcretemasonry.com/uploads/1/3/0/5/130539059/mibanuxu-fifedonu.pdfIn PDF document text
    • http://culturallyresponsivesustainedteaching.com/uploads/1/3/0/2/130291328/6280615.pdfIn PDF document text
    • http://mijaliscogrill2.com/uploads/1/3/0/2/130287503/dovulujitusaz_madaremimofiwux_dafetul.pdfIn PDF document text
    • http://rootdesigns.net/uploads/1/3/0/7/130740084/9694798.pdfIn PDF document text
    • http://sandyburlesoneportfoliowfu.com/uploads/1/3/0/6/130604207/1938303.pdfIn PDF document text
    • http://wugosirej.provzor.ru/uploads/2020/01/29/2a74bd9.pdfIn PDF document text
    • http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/6/130639251/130639251.html#bilal+saeed+bewafa+song+freeIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1 8360 bytes
SHA-256: 4ec20485f98b85eac42f28d446e336be46946f300cd860da49919ccdfb3ff6d9
font_01_sfnt_off000061e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 16824 bytes
SHA-256: 578b3955b0dc8fb439f663f3482be4259c3b85779a00d740e7ab00718e693f78

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