Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d1176e639ba705…

MALICIOUS

PDF

77.3 KB Created: 2021-03-31 22:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 46484f7512c882fe1cdc4e8774a9cf1c SHA-1: bae3d61de01f1c055068d97ecd6153050d516a5b SHA-256: 37d1176e639ba7054492be00a9f481608136cbbe65f2e45c6620562e98234dc5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://maypoin.ru/strik?utm_term=briggs+and+stratton+500+series+158cc+review PDF link annotation
    • http://sumapewub.getenjoyment.net/chromosomes_and_cell_division.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/salojorerafej_finifo_pimuvusogulib_reluwowalam.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/ea2690ec3936781.pdfIn PDF document text
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/3797388.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/autodesk_inventor_stress_analysis_tutorial.pdfIn PDF document text
    • http://nakaxovatixokew.22web.org/cardinal_wiseman_catholic_school_coventry_uniform.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/5616919.pdfIn PDF document text
    • http://wupuluku.22web.org/broadcom_bcm2711.pdfIn PDF document text
    • https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/a295b10c610f.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/executioner_meaning_in_tamil.pdfIn PDF document text
    • http://sakazopipabuw.22web.org/how_to_free_aim_crossbow_dark_souls_3.pdfIn PDF document text
    • http://vikiwamatibude.22web.org/rameburagup.pdfIn PDF document text
    • http://koparikamoze.scienceontheweb.net/lofenovaloxekinuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalizavok.rf.gd/10423636576.pdfIn PDF document text
    • http://wezobizezet.rf.gd/38297841775.pdfIn PDF document text
    • http://dazozelagur.epizy.com/chahun_main_ya_na_female_song.pdfIn PDF document text
    • http://migovapofuku.rf.gd/how_to_study_for_hesi_exit_exam_2019.pdfIn PDF document text
    • http://fubolorira.epizy.com/sig_sauer_p229_owb_kydex_holster.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_3c894a100b7e46e4b7fd4904fca3770d.pdf?index=trueIn PDF document text
    • http://bowuxok.epizy.com/macbeth_graphic_novel.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/substitution_method_worksheet_math_aids.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_fbb5b2878c0346b095afebd32b63e60d.pdf?index=trueIn PDF document text
    • http://gakuxidufujun.rf.gd/wolus.pdfIn PDF document text
    • http://kixukad.epizy.com/kufulabusotorapib.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_67146c72eae54c8da1cb49e6820416a3.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_60e3f8bf0f764b84a03ad4ac02db3469.pdf?index=trueIn PDF document text
    • http://fefadipif.rf.gd/duwutaz.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_75b0644c9b5f4cc8b9600f411e3fd476.pdf?index=trueIn 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_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 5788 bytes
SHA-256: fa7ea2043c90e16f87a75e73dc155b85b1a54297da0de46def2d15e9958950aa
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 11464 bytes
SHA-256: 26c4fb9424d9149e19017b5180eab20d05028107c29b5fdaab8102c66126f878