Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dbae14736668e6…

MALICIOUS

PDF

77.3 KB Created: 2021-02-22 15:56:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59ab2592f2c329a5abad25ccdccd6bc2 SHA-1: b21f70188c0d36669d155ac2dc2f4c3fa642a0c7 SHA-256: 38dbae14736668e6bddabb5309a4ff291181575feb55bd7e36e5baefae1a582c
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing SEO tactics to attract victims. It contains numerous external links, with a primary redirector identified as https://leonvi.ru/strik?utm_term=how+to+use+gimp+2.10+on+mac, which likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=how+to+use+gimp+2.10+on+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ffa86ee720bd.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/c0nMVjh/jidepuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5feee15583b69.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/1905038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6013cd600eeee.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/piiggja/best_slice_of_life_manga_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/geJ3BEr/ire_blood_memory_mod_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/dikabopagesi/ynjbouO/short_ride_in_a_fast_machine_genre.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/fesarefok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_60161b0cb86f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keputeka.epizy.com/best_kundli_software_for_pc_free.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/cbx_200_strada_manual.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_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 5536 bytes
SHA-256: fd0aca79ad06bf9c56d7cdad8a2e5ef450b00407fa2c14d5996d46a51228b956
font_01_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 10712 bytes
SHA-256: 098209a301a3a949b7a4760c657f33979618f87a6def92288b7ef1172d046a37

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