Malicious PDF — malware analysis report

Static analysis result for SHA-256 140bdbcf7f3c161c…

MALICIOUS

PDF

71.4 KB Created: 2021-03-19 06:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15045c61a776a6530713eb6ded80c312 SHA-1: b49df32af691a74f981e616d2b4d6a91abbf841a SHA-256: 140bdbcf7f3c161c88c64ff1c679e7dcd5de2b2d69b342d2220b0226c3b6bcc1
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to redirectors and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

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://xajibur.ru/strik?utm_term=edelbrock+1406+installation+video PDF link annotation
    • http://kojijeku.mygamesonline.org/zatolajixisixusexigefis.pdfIn PDF document text
    • https://lamobivuletopuk.weebly.com/uploads/1/3/4/8/134863798/9976911.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/69713028777.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/ibhiWxH/13864574586.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/1701de.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jbgdRZB/nda_exam_2020_answer_key_set_d.pdfIn PDF document text
    • https://xalitive.weebly.com/uploads/1/3/4/3/134320973/642931a351.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/hejigd1/tafijofolisuzuvirewi.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/Aia7JYB/name_the_celebrity_saddest.pdfIn PDF document text
    • http://winewelimefavo.iblogger.org/fowufinasin.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/dunofikuvugifugogukojexam.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/hdViWgi/art_masterpieces_to_recreate.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/vizegemawokaxe/31559002255.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/tujapanadotu.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/hadestown_sheet_music_wait_for_me.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/nowiju.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/8474308902.pdfIn PDF document text
    • http://lusiromipu.epizy.com/pro_points_calculator_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/wenijoxuvodat.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/46677754587.pdfIn PDF document text
    • http://wozinad.rf.gd/mukonupemaratabinimos.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/esv_reference_bible_review.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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 5588 bytes
SHA-256: af310b2650ae097ec397564b9c2eec72acd60fe1b2d3f6f24b7bf1cdb9431855
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10680 bytes
SHA-256: 214ca4356be4a3456bdabc1eac1439d46c4f76bf0e6b4854fa4031d84896c9e4

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