Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7d45ea776bdb61…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 16:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 815f7bb9f86d74bb2e87febfd36a19e8 SHA-1: d2b8d2471085a4b117f5d31ab6ddb048bf5fe165 SHA-256: 4b7d45ea776bdb6166fdf35d43412c20c0fb0c56b52b635955e7bd777ab26622
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, including a link farm and an SEO redirector pointing to 'https://dugedepay.ru/wix?keyword=atv+apk+pro', which is likely a phishing lure for downloading software. The PDF structure and embedded links suggest an attempt to trick users into visiting malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/wix?keyword=atv+apk+pro PDF link annotation
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/07160802e.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/5969275.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/riwovigotevabi_dulareloj_pivov.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/iejcgeO/42870509548.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/uqjaox9/rasevilimomopezinure.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/w2fifje/48468306260.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/guxebeba.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/jiLjeHe/never_have_i_ever_dirty_questions_for_guys.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/galoledek-tolubonek.pdfIn PDF document text
    • https://mixowobigasobu.weebly.com/uploads/1/3/1/1/131164278/2909025.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/puretulenuza/faxamefufebuwolejos.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/housekeeping_marilynne_robinson_film.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/laxebofa.pdfIn PDF document text
    • http://fopajika.epizy.com/95006492933.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/speed_test_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/nujebikeginivilupas.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/neoplasia_de_prostata.pdfIn PDF document text
    • http://vuxifonodine.epizy.com/fevejemobawe.pdfIn PDF document text
    • http://gogufujupi.rf.gd/xavapinipub.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/how_to_play_the_ukulele_for_left_handed_beginners.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/ariat_clothing_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/55494337562.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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 4716 bytes
SHA-256: 203772768b10165773508328488357e0e9c8644dcd9197f24511373e1d0c5709
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 11468 bytes
SHA-256: f950b1c96a4546df5e99598ed87a36aa0eee83bff3ae8dab5ecef7b26f652e86

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