Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e77d768427419d8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-30 12:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2f7e2c15c4e1dea5309d3917583c5c7d SHA-1: 90b1fc282273fb9cb7926fdc55e82ec431730da8 SHA-256: 7e77d768427419d8b9ddbd38d15f4b3ce156a5506eb216afdf68139c95b759bb
194 Risk Score

Malware Insights

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

The PDF file contains multiple external links, including a link farm and a redirector URL, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of embedded links points towards a social engineering tactic to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7312

Heuristics 5

  • 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.
  • 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
  • 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://ponafet.ru/strik?utm_term=who+is+the+strongest+monster+in+greek+mythology PDF link annotation
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/jolakap.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/86426443936.pdfIn PDF document text
    • http://wegafanu.iblogger.org/how_to_turn_off_logitech_f710.pdfIn PDF document text
    • https://wopulatizu.weebly.com/uploads/1/3/4/3/134348797/bagizuka.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/5830717520.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/searchs_linux.pdfIn PDF document text
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/dazofawizinib.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/fiminos_vutar_rewapejufigalu_bagojagol.pdfIn PDF document text
    • http://zafogititug.22web.org/vapikaj.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/tojabixefova/omaker_m4_pairing.pdfIn PDF document text
    • http://zinejamobasuwul.epizy.com/70871252267.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/xofuzuvisolidudilim.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/christmas_images_jesus.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/23071646803.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/sazenodoxebasiguzugab.pdfIn PDF document text
    • http://vuvinumebipoje.rf.gd/warifu.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/xokasotomebunukow.pdfIn PDF document text
    • http://muvotezazalad.epizy.com/formas_de_comunicacion_oral_y_escrita.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/pixirajakafedusemukurof.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/logowulumazufogisazavolu.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/valentines_day_images_free_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/funnyhouse_of_a_negro_full_text.pdfIn 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_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 5068 bytes
SHA-256: c91bf84f275b57b806a7d347febb3b9415aaa56ff487fdf0847278db8a8d248e
font_01_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 10652 bytes
SHA-256: 13d90c8ff29af468caa409e385940fe8d7a14b4b44470a6d14a3dd0dd9f4cd54

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