Malicious PDF — malware analysis report

Static analysis result for SHA-256 267b459010513add…

MALICIOUS

PDF

76.1 KB Created: 2021-05-08 08:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a067b02328dc584cb8c3aa2b3a3a37c SHA-1: 202d34acb56ae74799b405b86640d4017c31f385 SHA-256: 267b459010513adddd450c289e07371e404b21cd7fa7c884c17b34537d3d71e6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=colored+pencil+techniques+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/nugutobudan/jcs14BY/mokababetomed.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/lunotezaroperon.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jgNhjZy/pancake_recipe_with_pamela_s_gluten_free_flour.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/1333537.pdfIn PDF document text
    • http://nerroba.info/wawujisejojoviwtnh9.pdfIn PDF document text
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/e57ebe4.pdfIn PDF document text
    • https://cdn.sqhk.co/mejabutumu/cjbhdH2/winixivaxun.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/528258.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/hf8g2ja/32816054565.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/1hhr2Pj/2169075601.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/9283216.pdfIn PDF document text
    • http://trynutra.shop/the_sky_is_everywhere_free_downlumeol.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwibinewife/ohi28Jq/38159236968.pdfIn PDF document text
    • http://pressit.space/video_format_factory_onlineuv68o.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/wadifag_kupirevapow_nutokozetujixok.pdfIn PDF document text
    • http://idealicait.site/20984952261cfh7x.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/kebazobuwuzo_betap_puluxevuf.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/Mhca5Xn/miui_dialer_apk_port.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/charles_bukowski_quotes_dont_try.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/sinonimo_di_android.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/28222845122.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/what_is_the_tree_of_life_lds.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/23859599819.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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5220 bytes
SHA-256: ec5115aa4e2773a13ddea0fdc39ed53d279836b722feae191b751a918acf8d4f
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 11056 bytes
SHA-256: bb1e84a63aa75a81420e89444c2bc7e9c1fca3174f5beec161a8e27eda2eb6a3