Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa2f67056c035be…

MALICIOUS

PDF

84.1 KB Created: 2021-03-28 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d931071541fff2cbecca7aca7cfae6af SHA-1: 33f125e044ac234e058b502277410189af5931b5 SHA-256: aaa2f67056c035be68a36e71f18b6474cd78e2600fc66553343c8ceb5b03581a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though partially corrupted, contains references to 'zday survival simulator apk' and 'wkhtmltopdf', indicating a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=zday+survival+simulator+apk
    • https://cdn.sqhk.co/dapumexader/ihiibgp/natural_coffin_nails_designs.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6047fa876bc0d.pdf
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/f5dfe.pdf
    • https://cdn.sqhk.co/kimorotadopo/djjjhig/aruba_road_map.pdf
    • https://cdn-cms.f-static.net/uploads/4366362/normal_605f744e6ca0b.pdf
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/pofarigenam.pdf
    • https://cdn-cms.f-static.net/uploads/4467589/normal_605fd3e7e5d21.pdf
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/478415.pdf
    • https://cdn.sqhk.co/nowovadizeb/hfuAhc3/ladewasujadejewa.pdf
    • http://betifogolejom.iblogger.org/business_letter_writing_format.pdf
    • https://cdn.sqhk.co/gawarebadal/Mijjc76/modajuzagotedal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wunojipu/removing_a_honda_mower_blade.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_d62ed02158a9425a834eeadd7c1393c7.pdf?index=true
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_d0de2b7f94a346f69e5222ae16e01061.pdf?index=true
    • https://s3.amazonaws.com/zabejuvijolu/dmv_written_test_study_guide_new_york.pdf
    • http://temomuduzuba.epizy.com/the_economist_magazine_free_download_august_2020.pdf
    • https://s3.amazonaws.com/zaxuledo/nakaruwatoroworare.pdf
    • http://vejabimumen.epizy.com/luxizoxalefev.pdf
    • http://fopewawefive.rf.gd/59667146414.pdf
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_3d852cf555704dc780367d96786ce0d2.pdf?index=true
    • https://s3.amazonaws.com/wozowuledij/push_notification_using_firebase_in_android_example.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_off0000fc85.bin
10e7201bbc32f3117c8387d3b98df225c1082762e9f5ed7b7523381c3cc4e0cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 4944 bytes
font_01_sfnt_off00010d64.bin
f35e5d98c8c43b70543b11e1c90d078bec87405ef86a9a8cb4298f0c96a5a960
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 11136 bytes
font_02_sfnt_off00013369.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 4324 bytes