Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afabe86925712fa…

MALICIOUS

PDF

70.3 KB Created: 2021-03-14 02:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c3a07ba0903215d181c32bd529619c61 SHA-1: 1f537c50f7058196c166bfeb8ec058b8f489a7ea SHA-256: 9afabe86925712fab564d2437877728d046feaa636a52cdbedf4bebd77be3fe4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to 'financial algebra workbook answers'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=financial+algebra+workbook+4-1+answers PDF link annotation
    • https://cdn.sqhk.co/kitaparek/uhahghf/wetofibatoburumofivunor.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/47686689035.pdfIn PDF document text
    • https://sinujezujano.weebly.com/uploads/1/3/1/6/131606051/16ab6df42.pdfIn PDF document text
    • https://sebipujo.weebly.com/uploads/1/3/5/2/135294987/ruzopiji-pewibevexo-pidupez-fekisosawularap.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/nesubetew.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/INwT6jc/gogugitelumumisu.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/059Fibt/22183329503.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/poranujamud_sogajevezoruw_buwadadasevite_kinejutedefer.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/hcpdjfP/61261026421.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/SB3hhYO/xamadiluzipu.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/450403f223ea.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/lLG0iaZ/easy_recipes_with_german_chocolate_cake_mix.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/2655519119.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/gjhd6ib/cartoon_cat_wallpaper_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/rixosadiv/Yjegh8c/kakizun.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/tenijawusutefopope.pdfIn PDF document text
    • https://selewoxad.weebly.com/uploads/1/3/4/5/134523288/notoledixewadux_rimevevom_vewofamutije.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/bbf4f.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/igflz2O/european_war_3_mod_apk_unlimited_medals.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/5738634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowimirozox.atwebpages.com/fiwozoxopi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 5392 bytes
SHA-256: cef2d17d457386057caf11b26afea58bed6a38cba3eae132fd5adb96280cc6c8
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 9680 bytes
SHA-256: 879908a58cbd695c3b91908af411d670dca8ed5d7b10a0726857fbff83c783c1