Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3b3a26835ee1f6…

MALICIOUS

PDF

78.8 KB Created: 2021-04-14 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 27ac3e4db487c1abfd0cf2e70e940696 SHA-1: 28ed39df89056f34747e537063933da4bdce8c37 SHA-256: 2a3b3a26835ee1f670290886264d260677ee77d0e40e8dca06018e944a94ed2c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to an attempt to drive traffic to potentially harmful sites.

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://kuzutuzo.ru/strik?utm_term=what+would+you+rather+do+game+questions PDF link annotation
    • http://copyrightsupporteds.com/kozupuviziwuwekanat7p3nf.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/iajechh/39823072973.pdfIn PDF document text
    • http://betmoy57.com/midawildf88.pdfIn PDF document text
    • https://cdn.sqhk.co/nisavivurefu/e1A9gfR/akimilaku_remix_song.pdfIn PDF document text
    • http://clubstore.info/frases_de_100_aos_de_soledad_explicadasr1guo.pdfIn PDF document text
    • http://gakmancreatures.ru/realidades_3_capitulo_3wpzex.pdfIn PDF document text
    • https://cdn.sqhk.co/fotutubujuf/Bq4jdbb/drone_remote_start_app_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugoguzof.rf.gd/understanding_pathophysiology_1st_canadian_edition_free.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_8d14e234c2644b1eab3c3e1133976fdd.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_bc03582c4f3b43a9beae81e9822d7dbd.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_474e0834163d4df295109b5374a65bde.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_2f1913aa900542ee86652f569d74da0a.pdf?index=trueIn PDF document text
    • https://721ea522-a1f6-4523-903e-24b3c8014629.filesusr.com/ugd/5a834c_85457660bda4408b9528671950a7ba23.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_663a38c2ff3e46f3b6733652381bd7cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/android_google_sign_out_button.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/budd_chiari_syndrome_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/how_to_change_code_on_genie_keypad.pdfIn PDF document text
    • http://jujiruweji.epizy.com/27948564426.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/tixozanikubodaximezujazu.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_0a11284fb6d4412ca356c5bc1ed7ffbc.pdf?index=trueIn PDF document text
    • http://derefoxawuziten.rf.gd/aged_care_funding_instrument_acfi_user_guide.pdfIn PDF document text
    • http://kikevanalujik.rf.gd/how_to_get_power_of_attorney_for_elderly_parent_in_texas.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_7b6f56a6c6a14003a56883a2662b296d.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_0d49af40b5e84e88a8e08cea013757c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/fukap.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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 5572 bytes
SHA-256: 9064af6f284df70a861326b6bb15615938742f414001571e977bfa715732eff9
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 11548 bytes
SHA-256: aaddc22840bd428e1d26d04997ee65f01087b2dbbda8e7d51bbe76c222686695

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