Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f6ca8d4fa00dc6…

MALICIOUS

PDF

84.1 KB Created: 2021-02-23 14:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 993d0b00f7ab7bd4fedb91476bdb0079 SHA-1: afa01ab77881ee7197ff3db1b699b9922505a54f SHA-256: 53f6ca8d4fa00dc684d754913549c5321deb9ab1dc221a62325c4084c61e4bf2
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious websites, likely for malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=scarlatti+sonata+in+f+minor+k+481 In PDF document text
    • http://fixmarker.fun/retmenlik_uygulamas_1_staj_raporu_rnei7spie.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ichhgdk/mobile_facilities_engineering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_603439753eaa2.pdfIn PDF document text
    • http://virona.org/worksheets_on_possessive_pronouns_grade_4wvhw0.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/536855.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/i8haOhf/rutisoxitedasizisudetu.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/gijfbrR/one_gun_stickman_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/jfvehe8/lyrica_pregabalin_fibromyalgia.pdfIn PDF document text
    • http://3gusevshop.website/sisipagipitafisokarasogefyxix3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5ffece119f161.pdfIn PDF document text
    • http://comp-arenda.site/jufatunudivarouufi6.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/1037545.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/jekgfmf/negipija.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/JjeghA6/liwoxedexerafidarilepaxeg.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/02521787.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/7e0141943a.pdfIn PDF document text
    • https:///\/kirby.radiofrance.fr,bron:FRANCE_MUSIQUE_WEB,player:{is_active:false},page_view:{is_active:true,label:page_view},element_click:{is_active:false,label:element_click,matrix_element_id:{recommendation:musique_reco}}},path:%2Fen%2Fconcerts%2Fmusic-performances%2Fscarlatti-keyboard-sonata-f-minor-k-481-performed-jean-rondeau-In PDF document text
    • https:///\/kirby.radiofrance.fr,source:FRANCE_MUSIQUE_WEB,player:{is_active:false},page_view:{is_active:true,label:page_view},element_click:{is_active:false,label:element_clickIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fibesezati/abrao_forte_hungria.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/4069405554.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/45132389058.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_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 5528 bytes
SHA-256: 5901a73dbf95df02b0232eccbac3bd19b718ee7b88bc8de79e90fb8ccccdf536
font_01_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 13332 bytes
SHA-256: 097ea715a29d181969bea3ef37a72a4f1089d686441929c400c7558a06f877f8