Malicious PDF — malware analysis report

Static analysis result for SHA-256 8383e7e6ea837043…

MALICIOUS

PDF

83.8 KB Created: 2021-03-20 14:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0865653591de3464a746793637bcb653 SHA-1: b60e92c9bdca176ddd8dbabac1743749f0f6d910 SHA-256: 8383e7e6ea837043788a036159152509988f2638f950a8d239d816060f0a07f4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm for SEO manipulation. One of the primary external URLs, 'https://xezojetit.ru/strik?utm_term=beretta+93r+bb+gun', is flagged as unknown reputation, suggesting malicious intent. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=beretta+93r+bb+gun
    • https://cdn.sqhk.co/dekawako/ehaPgfH/vifaboviviposukerepej.pdf
    • https://cdn.sqhk.co/doporaba/whaO8di/75666564639.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bf2f232-a2bc-4ef4-8ebe-50f5e5fab908/88672208389.pdf
    • https://s3.amazonaws.com/savukojubusum/rampage_ruins_ctr_guide.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_1de70c6203be4400821b73e085a47dd7.pdf?index=true
    • https://s3.amazonaws.com/zamuriza/35558936398.pdf
    • https://uploads.strikinglycdn.com/files/46368b01-c583-4377-9b13-f4306186e8a5/asus_strix_gtx_970_4gb_review.pdf
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_c007294b73d34f13a77de1c37e5bb213.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/rapexeliseludesu.pdf
    • http://jigotubefaso.rf.gd/an_overview_of_statistical_learning_theory.pdf
    • https://uploads.strikinglycdn.com/files/6fede5c9-39c8-4bfb-be62-6260b0f72e59/how_to_set_a_home_page_on_microsoft_edge.pdf
    • http://lufafutogixafu.rf.gd/25547852442.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_2b6fa6f0efb541a9b3942b7edd6afa29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88dd92c4-9248-4f57-9a55-edc73c499142/xobevilowivujoxofuvos.pdf
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_1c97a6267edf49ba90821a72587fb62d.pdf?index=true
    • http://risitikavaj.rf.gd/jambox_mini_owners_manual.pdf
    • http://rafodize.rf.gd/descargar_biblioteca_del_evangelio_sud.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_fb8e70092d764e1fa02b70869c776010.pdf?index=true
    • https://s3.amazonaws.com/mogipegi/44953802386.pdf
    • https://uploads.strikinglycdn.com/files/6c11f14b-8671-4b91-a769-78ae526c01ec/audiolibro_caballo_de_troya_1_mp3.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f628.bin
ddd541ac98a246c46ea5d47eb81714b9ed1351288680ef64e313a3ce5b4bd9c0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF628 12588 bytes
font_00_sfnt_off0000e49c.bin
ad3f0c491f46f790bc9dc404a497aa0550a5d8e93ee902bebee5047f7a57286f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5152 bytes
font_02_sfnt_off000119d6.bin
be37c4925c0db3f3ced392143923ac57b2b2f3600cf45aedcc55e2570779658a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10948 bytes

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