Malicious PDF — malware analysis report

Static analysis result for SHA-256 65737637312b2d21…

MALICIOUS

PDF

239.3 KB Created: 2021-03-15 21:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f04cae62746c4f86ae8a762f9353dc19 SHA-1: 2c35608af521c4b3387eac179fe90101845957e5 SHA-256: 65737637312b2d21d55932cdae177b402ae224c1b1aba69af69e4bb45fb53ec7
136 Risk Score

Malware Insights

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

The PDF contains multiple invisible links, one of which is explicitly flagged as a CAPTCHA lure. The primary malicious URL identified is 'http://xuxoxobu.iblogger.org/add_captcha_contact_form_7.pdf', which is likely used to host a phishing page or a further stage of the attack. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7125

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://ponafet.ru/wix?keyword=clear+answer+meaning PDF link annotation
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/bijixuzaxudum_ranosib.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/73455074825.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/monster_meaning_in_bengali.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/vajibakite.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/rukoma.pdfIn PDF document text
    • https://kinijenu.weebly.com/uploads/1/3/4/6/134641264/2262217.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/3216028.pdfIn PDF document text
    • http://normaa-id.com/from_a_to_zay_hard_copy_meaning2m9p5.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/zamoxo-kudonigemomat-vewivi.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/xibikugozonax.pdfIn PDF document text
    • http://fringigejy.site/21506653074xkosc.pdfIn PDF document text
    • http://xuxoxobu.iblogger.org/add_captcha_contact_form_7.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_3a566999328544f7bf39ee8a25545eb6.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_8a67e2b016f74c1a944edbdbee9cf4fe.pdf?index=trueIn PDF document text
    • http://dezobod.onlinewebshop.net/cvc_worksheets_for_kindergarten.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_394b282847c34ab286d4d356aafffa2e.pdf?index=trueIn PDF document text
    • http://pagupim.epizy.com/visual_reinforcement_audiometry_tick_sheet.pdfIn PDF document text
    • http://likamufibunefar.epizy.com/new_bengali_film_full_movie.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_965655d20b7c407fbc3d39fe77795fa4.pdf?index=trueIn PDF document text
    • http://jagazasa.epizy.com/hp_1320n_windows_10_driver_download.pdfIn PDF document text
    • http://dopovis.myartsonline.com/3136768479.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/authority_jeff_vandermeer_explained.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://www.gnu.org/licenses/gpl.htmlIn 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

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00020fa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20FA6 55332 bytes
SHA-256: 6bebec1f0818d502846361cf11160b0ab062fd9cd204f3e720335179df88afd3
stream_005_off0002c83f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C83F 13936 bytes
SHA-256: d8dec5d477f3350d05ee5bb5ba765ea1ed82dda95e5d3f9f5a06b3ce599b4a4c
stream_007_off00034602.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34602 35000 bytes
SHA-256: a00310ce67eb6e9cf910f41b0ddb85a444197b36e8e5021fc26d8103a8187bd8
font_01_sfnt_off0002b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B860 4716 bytes
SHA-256: 734af49ab1a4420919824ee1420310c4cd7e5866718debe5cec37489a3ffe087
font_03_sfnt_off0002efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFAF 35204 bytes
SHA-256: b0aef5ff787d237d730ba54fbe84c25cace80debf4b6cb2de23cf3cc14c16c03
font_05_sfnt_off000380e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x380E3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_06_sfnt_off00038ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38EE4 9432 bytes
SHA-256: 86e7947a7f5254ce92163c17166e9258cc1171328844113a0a4e72b5eb9cf6dd

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