Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b26c3dd2014af23…

MALICIOUS

PDF

45.5 KB Authoring application: Smallpdf Desktop
MD5: 2d5debc5fec05e5eeb5bb07ae354707c SHA-1: 12de6a79c11b1c6676379e249dec180aa6ede483 SHA-256: 1b26c3dd2014af23984ff1c2b102fd3f84b32261741d312a51c6f2e53c935abf
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, with the primary one being http://senalista.com/uploads/1/3/0/4/130490681/16a3572b0b.pdf. This suggests a phishing or malware distribution campaign, leveraging a link farm to obscure the ultimate destination or to distribute various payloads. The document body, though containing garbled text, mentions 'Education psyche reading answers' and 'IELTS Mentor', likely a lure to entice users to click the embedded links.

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://senalista.com/uploads/1/3/0/4/130490681/16a3572b0b.pdf
    • http://beyoncecollection.weebly.com/uploads/1/3/0/5/130589161/8760414.pdf
    • http://officialbluehangers.com/uploads/1/3/0/6/130621951/d80b81b5.pdf
    • http://ped.sianie72.ru/uploads/2020/01/27/aecdef5dc2e9708.pdf
    • https://totinusi.weebly.com/uploads/1/3/0/4/130476359/rutuxolota.pdf
    • http://europimec.org/uploads/1/3/0/6/130604361/6567078.pdf
    • http://mugedatid.yeguadadosvaqueros.com/uploads/2020/01/29/nelanusosum.pdf
    • http://noirnooga.net/uploads/1/3/0/3/130312983/3332217.pdf
    • http://lk-rostelekom.fun/uploads/2020/01/27/laxaletade-degula-torotaravas.pdf
    • http://blubloggs.com/uploads/1/3/0/6/130604640/fekiwera_rebixaji.pdf
    • http://sauerlandhypotheek.nl/uploads/1/3/0/6/130639530/130639530.html#education+psyche+reading+answers+mini+ielts

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001286.bin
9421c87d971120141c3e6bf49bf32c6ef082bb0c82e51a59e16996195a3ad257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286 8788 bytes
font_01_sfnt_off000067e2.bin
8541ebf6aa518028a3032c696344dfacf154ca588bde07b99aa7cf15e9f61f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 17564 bytes

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