Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9120cf0ef80604b…

MALICIOUS

PDF

78.5 KB Created: 2021-05-12 10:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 544e3a14dececb8f4f6d375ebd8c2a6f SHA-1: 9c4131bfa53c65ee90e2ac27c39a95352a6b5f38 SHA-256: a9120cf0ef80604bebfa3bc8e4dc9f3701a0451b600bd02d708ad459d5b23b12
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The document body itself is largely unreadable, suggesting its primary purpose is not content delivery but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+many+calories+in+an+iced+coffee+with+almond+milk+and+sugar In PDF document text
    • https://cdn.sqhk.co/wimiwupo/jf7xT4D/abalone_price_per_kg_in_philippines.pdfIn PDF document text
    • http://notidokamokuz.22web.org/37278840485.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/cambridge_english_business_5_higher_student_s_book_with_answers.pdfIn PDF document text
    • https://wuvonavozaf.weebly.com/uploads/1/3/2/6/132695620/dopiwuwilo.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/bsc_3rd_year_physics_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/iggjijQ/basketball_trick_shots_to_do_at_home.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/eb15fa2dc0d3d.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/e4lighc/luwudorokesesi.pdfIn PDF document text
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/vavapefuw.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/je7hhjj/minecraft_zombie_apocalypse_mod_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/gib8L0J/nuzugop.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/hfShigT/sunukemurutopokosokodujox.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gTJ5Tjc/beach_buggy_racing_mod_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/tabawapizak/ejjj4Sm/dual_citizenship_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/i5jfihz/54356321551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafebofegev.epizy.com/lenovo_thinkpad_t430_recovery_media.pdfIn PDF document text
    • http://lukigek.rf.gd/c3po_event_guide_without_logray.pdfIn PDF document text
    • http://ridexasili.rf.gd/carto_de_vacinao_para_cachorro.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5652 bytes
SHA-256: e95ce9cb4b0b6ef32eb8a76f577bee9d4158c41b3152db0af76cfdda44956500
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 13244 bytes
SHA-256: 4b6aaf4d17db77f38f47b03ac4dde61c7c63ec11b74b7646ebf03039884da8bb

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