Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f65965cdb9f4b5…

MALICIOUS

PDF

72.4 KB Created: 2021-03-24 09:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fe7aa281a8854419f861eadac7777b7 SHA-1: de4e6e6ce4db6103dedfd693eadd5fda4220932e SHA-256: 58f65965cdb9f4b5bf9ff6754150e5c9b8f47af7587f907959b84e9cc938db4a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to generate traffic or distribute malware. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://resalured.ru/wix?keyword=clarinet+fingering+chart+pdf
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/kubefa.pdf
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fe4416c93168.pdf
    • http://regse.website/940033399965rwk9.pdf
    • http://womixiwulaj.22web.org/foundations_of_earth_science_7th_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4450430/normal_603e15f601676.pdf
    • http://xiruzox.mygamesonline.org/antenna_and_wave_propagation_book_download.pdf
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/jetajoxexe-sokebuxususupi.pdf
    • http://wosedumuf.mywebcommunity.org/beps_action_3.pdf
    • http://expo-kit.ru/80446337376p4m1b.pdf
    • https://cdn-cms.f-static.net/uploads/4451549/normal_602c4d41af3e9.pdf
    • http://balonedud.iblogger.org/bekujubiwewubozirabatesa.pdf
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/8819391.pdf
    • http://fapasevusiledap.mygamesonline.org/zexomewagurub.pdf
    • http://bomisedoxu.mywebcommunity.org/fajalazikutulelexituka.pdf
    • http://juvipozufuxu.22web.org/catholic_bible_reading_plan_2020.pdf
    • http://naturfresh.space/fuzirukidekawetenizaluvadjd22f.pdf
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600c9dd78457d.pdf
    • http://deemonatrafik.xyz/automatic_flight_control_system_helicopter61216.pdf
    • http://zanakodus.22web.org/fuxoben.pdf
    • http://paktum.pro/624064687546ul1u.pdf
    • https://nobenore.weebly.com/uploads/1/3/2/6/132696051/5e8f5.pdf
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/4597319.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zubutavobidu.rf.gd/samsung_un65ju6700fxza_curved_led_4k_ultra.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_6f4dccaf6eac4137907701b28866c52c.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_8cd310efb5754417ae3a9aa9a56f77c6.pdf?index=true
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_1508095dbe4d44139aea79a8c0be2bbc.pdf?index=true
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_c1d062c799a949d887a04a49178a9190.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7b.bin
88dbe32fbd2506e16021387108a284533a0a27ff27154a465bdfb3c3ef5ef0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 5144 bytes
font_01_sfnt_off0000eef9.bin
c72c590313118adae298068a919cdf796de8dd82482d8fcebdce45967a140984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10316 bytes

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