Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afb053e734eadb7…

MALICIOUS

PDF

123.1 KB Created: 2021-02-14 11:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50cbd4928bddc3a2736607e2591820db SHA-1: 41ca42aa6cdcb57fa0faf77661cd8c16890c35aa SHA-256: 3afb053e734eadb71a8ab2f7bfaaede82bb0cc6805d0fc99b4b550d88aec8db6
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site offering a 'spam bot download android'. This, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 4

  • 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://bologen.ru/wix?keyword=spam+bot+download+android PDF link annotation
    • https://cdn.sqhk.co/baruduwege/1jijhsu/balubezevevadumoratipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_600f744b9a878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fcf769598f26.pdfIn PDF document text
    • https://cdn.sqhk.co/mowuseparap/hggiju8/72387872528.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/aDXhdij/komolekiporusozugax.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/c985cih/the_hangover_2_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/heihhhb/marketing_mix_modeling_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/eqjjjjO/togeguxanat.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/jejihde/66988058626.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/Ylmigic/12153690238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_6000c6d05bfae.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/hergiij/trastra_crypto_wallet_visa_cards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/plant_biotechnology_reports_bioxbio.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/42552911907.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/android_studio_scrolling_screenshot.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/iso_disqualifying_disposition_tax_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/lalevevabilixozo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/risk_assessment_process_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/61057003944.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001b234.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B234 18056 bytes
SHA-256: d77e90961a665dd0ee677e411b025cc0794a37b531dc58001f47703a57b5bd2f
font_00_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 5588 bytes
SHA-256: b5a93e0296546f8cf9ee9616e22d17b281fb4345b687128b8a2b0e17f4e18c6a
font_01_sfnt_off0001492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 5264 bytes
SHA-256: fa93463fd859c5ac65f95802a99ae761246a66f093502bdffd6eba90ade3ac93
font_02_sfnt_off00015afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFB 5700 bytes
SHA-256: 0a87f45aeeffa5c073bfc6683d66510a783e894b353eb164451ed814a4eefe97
font_03_sfnt_off00016c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C54 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_04_sfnt_off00017c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C35 17620 bytes
SHA-256: 7e239b33073b3a19ffd5cf80e972e6af4e5d4f14e0c3fc3ea691e1c24a019f16
font_06_sfnt_off0001ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE80 3248 bytes
SHA-256: d2df2f28444d58050b3da91058ec373c0ec1c25a5d48260d91b7be46a2073155

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