Malicious PDF — malware analysis report

Static analysis result for SHA-256 379543fa446b3bb1…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 02:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 28478f9a9aff299053dcafee9cb45086 SHA-1: 2578c9ff3306d65c775b44833121dc518d445ada SHA-256: 379543fa446b3bb1a2c553bf4482c6b9c78627904df6b2fe2cfcf19a55a2a909
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for an SEO redirector link, indicating a phishing or malware distribution lure. The primary URL identified, https://nipisod.ru/strik?utm_term=why+freezer+make+noise, is likely used to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=why+freezer+make+noise PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480412/normal_6005191eaec4f.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/anbanavan_asaradhavan_adangadhavan_full_movie_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5feea3c75adc7.pdfIn PDF document text
    • http://50off.pro/benchmark_advance_-_grammar_spelling__vocabulary_-_activity_book_-_grade_5dkgj2.pdfIn PDF document text
    • http://montana-media.com/english_christian_songs_audio_free1kbei.pdfIn PDF document text
    • http://olipaka.xyz/digitech_gnx3000_reviewt2em8.pdfIn PDF document text
    • http://marketitaly.info/35980889256etinb.pdfIn PDF document text
    • http://vavawosasote.iblogger.org/radepifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5ff0cc054786a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5ff1487a08c47.pdfIn PDF document text
    • http://sarhello.online/jotoxesozibobijomiri60tje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_602d3d0b3976b.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/mamibis/consumer_reports_top_10_best_cars.pdfIn PDF document text
    • http://lujufidopugola.rf.gd/52911273264.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/my_airtel_tv_for_pc.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5204 bytes
SHA-256: 28f6763adc7a439da5d207dc643a7cbb7ebf6e78c0fc29134f27175d0056cd2d
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 10960 bytes
SHA-256: 68fc050af158303071fb7cc85539ced9e3dca3528c72c42cfc0cb90c336515f4

Open this report in the interactive analyzer, or submit your own file for analysis.