Malicious PDF — malware analysis report

Static analysis result for SHA-256 353f40ae81d58707…

MALICIOUS

PDF

76.7 KB Created: 2021-04-18 20:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a51c94c3a89e7cbaa82de6b4d8ffa6e8 SHA-1: bc4be62d635f72914fcadfe52e2613d4ba60cb2b SHA-256: 353f40ae81d587078835f86b87845da7666d3ade2ad4c3ce9993ec88088a1268
136 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'Harry Potter book 6 chapter summary' to entice users to click on an embedded link. This link, 'https://midufefew.ru/strik?utm_term=harry+potter+book+6+chapter+summary', is identified as an SEO redirector, likely for a phishing campaign. The PDF also contains a large number of external links, suggesting it's part of a link farm designed to improve search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/strik?utm_term=harry+potter+book+6+chapter+summary PDF link annotation
    • https://cdn.sqhk.co/losomilodip/fZhfBhe/cooties_hairspray_sheet_music.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/samsung_xpress_c460fw_install_toner.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/xutexizevipi.pdfIn PDF document text
    • http://didazema.mypressonline.com/xaliwidojofodijeg.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/hbVggDl/n64_emulator_apk_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a77dc1c-5824-4d7a-ad35-a0fba74330ac/70751552189.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_0fc606e5e32542259cfc51d8c135efcb.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_3369766a7dc845cda6ba03fbf8e8f6bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/25939394088.pdfIn PDF document text
    • http://palexibibiw.atwebpages.com/57729426169.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/away_in_a_manger_ptx_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/abide_forms_of_verb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968e6e52-8696-4e07-aa20-3bb59feb125c/90688334577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441c0e45-06bd-4ef0-bb15-fbefaa7843bf/lifetime_basketball_hoop_portable_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7a8627-2840-4dfb-abed-c6bd47fb7b2a/mufifu.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/ccna_exam_fees_india.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_739fa912219c4301a8b200fb4dce48d0.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_8e0ce54838014726b848826cc30dd87a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c11b24d-7fd1-4c16-97ac-85fd44b6f27e/dunkin_donuts_ham_egg_and_cheese_croissant_carbs.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/gastric_sleeve_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/96523234908.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/37531406743.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/nadawidemonevewonos.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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 5560 bytes
SHA-256: 0ac79c50bca7738f3c8bf084c9f4576094ed2f2da03feeb70f4e148a60b25025
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 11100 bytes
SHA-256: ce4afa6783aae542fe2087c9ef578b098b1616371ea0a068e7ac94d86f8ba63c