Malicious PDF — malware analysis report

Static analysis result for SHA-256 522fa15f9af3aa60…

MALICIOUS

PDF

80.4 KB Created: 2021-03-03 06:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7993be2ca9153b423445ec110e6245d SHA-1: eba64205a2ac5141ebeaf8d7de6d4d64f185eb46 SHA-256: 522fa15f9af3aa60424defcd8fa04fd28e4c3ccf80e390559465744fe99bbf48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a link-farming scheme. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://xezojetit.ru/123?utm_term=shark+lightweight+professional+iron+manual
    • http://bivodotofa.iblogger.org/befoxalevaginolobita.pdf
    • https://cdn.sqhk.co/rogenujudita/givVhSl/indoor_snow_slopes_near_me.pdf
    • https://cdn.sqhk.co/sixitigoxeto/iKLihgh/jevepavogison.pdf
    • https://cdn.sqhk.co/jawefujivi/jiGXKzr/risofuribibapizu.pdf
    • https://cdn.sqhk.co/vakolitakap/dPehc3W/smart_supplies_nashville_tn.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/8432777.pdf
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/6db98b4c.pdf
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/xutelevilagogaxogago.pdf
    • https://cdn.sqhk.co/bakavaxa/UVjjy8o/safazoxada.pdf
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fc9ec153ccb1.pdf
    • https://cdn.sqhk.co/wedegetuso/vvjegd4/zobiximesakapetip.pdf
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/16726.pdf
    • http://ninotekega.mygamesonline.org/dryer_not_getting_hot_whirlpool.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://piwakitidi.onlinewebshop.net/dr_seuss_paperback_collection.pdf
    • http://wonenuw.epizy.com/transunion_consumer_credit_report_codes.pdf
    • http://wilafeduzavedew.epizy.com/16464802441.pdf
    • http://gixarewujedel.atwebpages.com/zowemosuzowus.pdf
    • http://lemijafuw.epizy.com/emotional_love_whatsapp_status_tamil_video.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef9.bin
67c5787e262be9d3d3d2d586c2cff27925b4c8fad1425d86c7c1db5c440baf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 5456 bytes
font_01_sfnt_off00010169.bin
0c0720d613de8d2e22f541033acf0b8ebe33b1201bcba3cb03bdb23ec7a33c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 10560 bytes
font_02_sfnt_off000125a9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 4324 bytes

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