Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78b3ef322b3c496…

MALICIOUS

PDF

95.0 KB Created: 2021-03-10 07:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc6b50af1cc31ade62f4d21a59a775b6 SHA-1: bb82a4976882705777cb95a3c475c58b83a2448e SHA-256: d78b3ef322b3c496cc5705fc986a7ad631ae89d43ab36744cbffa2249935e5cf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it links to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=graphing+inequalities+in+two+variables+calculator`. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were extracted, the presence of malicious links and the overall detection suggest an attempt to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=graphing+inequalities+in+two+variables+calculator In PDF document text
    • http://7gusevshop.website/xuneperolusumfrzb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_600ece06d38bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6033abb8c1772.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/HjcaRej/21132288879.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/goficja/mirivepukatisutot.pdfIn PDF document text
    • http://harkateine.fun/english_speaking_guide_tokyoy4djl.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/eig5jf7/hustle_castle_facebook_link.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/ia2KFlf/vehicular_deaths_per_year_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fb6f0ff69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_60273d9385693.pdfIn PDF document text
    • http://immortal-sho.club/winijizobenemebudowexu68ppb.pdfIn PDF document text
    • http://in-arenas.com/kulolowojof0zdgx.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/90181764414y3ott.pdfIn PDF document text
    • http://lasleymarkt.ru/chirutha_telugu_movie_video_songs_freep70c0.pdfIn PDF document text
    • http://magnetfix.store/pakistan_studies_book_for_bsc_in_englishcnff7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefuxizimume.rf.gd/33630078740.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/adding_and_subtracting_simple_algebraic_fractions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/vufogixowevakejekewolamu.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/present_simple_vs_continuous_exercises_elementary.pdfIn PDF document text
    • http://kubatejabudebuj.rf.gd/xekomojopewawowexe.pdfIn PDF document text
    • http://pejezal.rf.gd/70492371673.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/badger_500_garbage_disposal_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/new_movies_2019_bollywood_wapwon.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_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 5644 bytes
SHA-256: 6cc98e3a9f07300aee098c5775c7c51efa6b0eee5528e82bde996e924cfc4323
font_01_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 11220 bytes
SHA-256: 846f6fd6bd1b9f5c43a133a02527a820ea551f6fc32ba265d51e0c15b6b91d7e