Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e32e90afba8ab6b…

MALICIOUS

PDF

53.1 KB Created: 2020-04-12 09:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 40396687c4264d725b4840f6a8a444f5 SHA-1: a609ab3e3c06a75f2bfcf08ffcee978e10ee5f98 SHA-256: 0e32e90afba8ab6b1c831aa0167bbc19777d50062a1a562499c4ab76d9c9a08e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it functions as a dropper. The document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The presence of a 'download' call-to-action further supports the dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.Dropper.Agent-9277029-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9277029-0
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://blackwisdom57.com/uploads/1/3/1/6/131606835/131606835.html#athlean+x+reddit+download
    • http://wewantsouthern.org/uploads/1/3/0/8/130814101/gelilagulasob.pdf
    • http://christinalulie.com/uploads/1/3/1/4/131408086/mifazamekobota.pdf
    • http://happyhealthystatus.com/uploads/1/3/0/5/130550797/1404791.pdf
    • http://tbodyworks.com/uploads/1/3/0/5/130589450/4930453.pdf
    • http://davidmcdaniel.info/uploads/1/3/1/0/131070238/sikanovawigiw.pdf
    • http://lcconstruction-dz.com/uploads/1/3/0/3/130323491/8391125.pdf
    • http://cybersocialtexas.net/uploads/1/3/1/0/131071082/sinazojivibipuw_fafenutatuloxoj_dapajazikosirex_nigutisad.pdf
    • http://proorganizerlindsay.com/uploads/1/3/0/4/130488547/baronilisakitalemu.pdf
    • http://yodel.services/uploads/1/3/0/2/130272493/kiludez.pdf
    • http://bonusmath.com/uploads/1/3/0/6/130621219/1477059.pdf
    • http://brighterbranding.net/uploads/1/3/0/9/130969097/bewilog.pdf
    • http://roofingmcdonoughga.com/uploads/1/3/1/3/131380470/1000484.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091a8.bin
d79c3448f7bc2a87ea97f8416770cb7902b917a09187bd878ef1553ee8d595c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A8 8940 bytes
font_01_sfnt_off0000b399.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16036 bytes