Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f88515692607fd…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 18:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 534f3a4adc28860b8fcdf0a1856845b7 SHA-1: e1f022e79d4687d97e9a5d2a7c2a3b8f2d609ca4 SHA-256: f3f88515692607fdcc01775075f1e3aa2ced768d323b481f76ed0bc3dc611fca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'baarspo.ru', suggesting an attempt to redirect users to potentially harmful content. The PDF's structure and embedded links indicate a probable phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=sed+awk+grep+tutorial+pdf PDF link annotation
    • http://pofudaw.iblogger.org/segudofutopamukodineta.pdfIn PDF document text
    • https://juzolafer.weebly.com/uploads/1/3/4/3/134382033/3082497.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/a_divina_comdia_resumo.pdfIn PDF document text
    • http://idealica-italiauficiale.website/56812688155lke8s.pdfIn PDF document text
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/kufizewike.pdfIn PDF document text
    • http://probmake12.xyz/budget_speech_2018_south_africayngqg.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/best_replacement_tubes_for_bugera_v22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6011ab085a3e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6037e5a7a2f88.pdfIn PDF document text
    • http://sq11mini.com/corporate_accounting_notes_in_hindibwpx1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_60026fff92021.pdfIn PDF document text
    • https://wijuzibodeba.weebly.com/uploads/1/3/0/7/130738798/kanamize.pdfIn PDF document text
    • http://top-salez.site/279812518106i8ds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibodezoboro.rf.gd/2020_ferrari_812_superfast_0-60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea4a493-0e0e-407e-97cf-4b9a89c74798/stihl_fs_56_rc_line_length.pdfIn PDF document text
    • http://bireses.rf.gd/xipetefadafokerom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60623b0a-a261-4a39-baf6-877039b53ae6/29898785043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ce8035-3231-44ca-95af-8395e1fe69ad/tilevojinozebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66a780a-e753-4597-91f6-34edbd5323a7/danukimulevefeginixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3534949a-dfc2-41e7-bee6-1e169522bc17/ramurekawej.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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 5288 bytes
SHA-256: 85e7bc388def498f23df0026155c40a53ad868237a1c3e648ea7d0705341cdb3
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 11756 bytes
SHA-256: 368d92fad4910a5ce45272b04b880d1c242c4660d3846cc91c3372130a7f2e31

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