Malicious PDF — malware analysis report

Static analysis result for SHA-256 274aa33550d00d2c…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 02:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f973993326a6edd5a3bf1e546339971 SHA-1: 225ff20959518a4ba5f43be3c63e40078400e889 SHA-256: 274aa33550d00d2c97c105435569cd7d88e4bc17f26c489b04e3ce10e68fa41d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and appear to be part of an SEO link farm. One of the primary external URIs, 'https://dafemum.ru/strik?utm_term=should+i+buy+a+house+june+2020', is flagged as unknown reputation and is likely malicious. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it is a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=should+i+buy+a+house+june+2020
    • http://jasazotinalol.mygamesonline.org/operations_manager_objective_examples.pdf
    • http://vutajazelige.medianewsonline.com/microplasticos_en_humanos.pdf
    • http://rarubife.mygamesonline.org/65613014628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_e73bffde4d7e456a8f4df218747a55c9.pdf?index=true
    • https://s3.amazonaws.com/xelimewat/60820162590.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_5c9994e57ba3454bb1360bd33168150c.pdf?index=true
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_389262fa6473435bb84809b52364e548.pdf?index=true
    • https://s3.amazonaws.com/bakoloj/19717155702.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_a5742269ea604b4d91bdeaf2a6d60865.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3767900b-dcd3-452c-817f-d041a5532041/danby_ddr050bgwdb_50_pint_dehumidifier_-_white.pdf
    • http://semowomeso.onlinewebshop.net/pamudativemazubu.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c88d6dd6cec04f3299b96e2c7d1288b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/585cfdaf-6021-48e6-b4e3-f060846fb4b9/82576867623.pdf
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_ae10da8b166a46d6b523ecf7171186ac.pdf?index=true
    • https://s3.amazonaws.com/duzexefemosaxe/maria_sharapova_class_9_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/7c07d115-917b-466e-8c68-07818a86f0c6/jvc_super_vhs_camcorder_tapes.pdf
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_430e9a6ccceb4877ba8e5a5a960d299d.pdf?index=true
    • http://lojibovel.myartsonline.com/garmin_gps_128_antenna_for_sale.pdf
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_e696056bb1234edfba370f0199dea1dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb2c3f31-d9a5-4910-a61e-404e029d4297/casio_protrek_pathfinder_watch_review.pdf
    • https://s3.amazonaws.com/mogipegi/vafokalerekadelijal.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_c27d87c83ea64685ba4ba818c6fa7f20.pdf?index=true
    • https://s3.amazonaws.com/bepukuba/rinewiw.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_637fee793668481ab2c3ae31d5041d55.pdf?index=true
    • 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_off0000f8de.bin
2ced1c06189e0fddebe891132891af98608d6d60d97c172730087fe7df53706c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 5316 bytes
font_01_sfnt_off00010add.bin
0c65a30eb66b6c24cb027b740ab390a933814c88a010b3f8f7f869147353c97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 11196 bytes
font_02_sfnt_off000130f8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 4324 bytes

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