Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a75bfd5975a0cad…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 21:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3dbfb2b097726b41a7f10b382fc41f44 SHA-1: 005cf80890fa568200d0749daf855f755d5f7863 SHA-256: 8a75bfd5975a0cadea456061de49eb8b24c17ec06df6f8b289deeca5110a3cc0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary external URI points to a URL that appears to be a lure for 'parallel structure worksheet 1 answer key', likely to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wix?keyword=parallel+structure+worksheet+1+answer+key PDF link annotation
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/duxiralawobak.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/Lhbjev6/hungry_shark_world_all_sharks_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ghOL8jg/5084468406.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/fixup.pdfIn PDF document text
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/9615075074d47.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/Ojes5gg/android_tv_remote_control_apk_mod.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/6476666.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/91ba9d36c45.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/hbgLqji/47989031931.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/chfhcii/balance_ball_3d_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/icnjiiB/rock_band_hero_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/jhgjgjb/zoriwozekozilowir.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/fuganakurejuketud.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/RNWtV7i/337193725.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/anatomy_drawing_school_human_animal_comparative_anatomy.pdfIn PDF document text
    • https://gibonubud.weebly.com/uploads/1/3/4/8/134877094/6796748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_90d64617e12f476d8f20da0091bd2682.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_27f18b4ebfdc460ea33a68dd91ae7a34.pdf?index=trueIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_1a3f65d43603451e9600227976232af2.pdf?index=trueIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_1a0c7a6225fd4f90b1a6f3a217ebe7f9.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5200 bytes
SHA-256: f0de85de075fa2091185669419ea8a2a01c594dedb7e0b1d282d7e2a14c027cb
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10884 bytes
SHA-256: ab2b57dab6e6ecdf5b0e0a901a45d1b6611c79c63256a49209a10f5c71eea5fe

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