Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc3cd12786e0f27…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 10:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7f1a937bd5ab5fe8b97efa16a5724170 SHA-1: d4f473a8451191e467e8bdffafb7a86df3b583eb SHA-256: 1bc3cd12786e0f274a56eeea0477e7c248b4659b903139e04c5618a7a516eae8
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains an external URI and an SEO redirector link pointing to 'https://xezojetit.ru/123?utm_term=formation+aide+familial+tournai', which is indicative of a phishing lure. The document body, though heavily obfuscated, suggests it is related to 'Formation aide familial tournai', likely a pretext for the phishing attempt.

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://xezojetit.ru/123?utm_term=formation+aide+familial+tournai PDF link annotation
    • http://hightrade.club/74195320798k8ezi.pdfIn PDF document text
    • http://harmony-market.ru/forakirifiramigibapotegutlw9b.pdfIn PDF document text
    • http://mexicotop.xyz/xuwaturaxejufomewaiv1gl.pdfIn PDF document text
    • http://alex-chekalev.com/50379666922tts51.pdfIn PDF document text
    • http://dhl-order.info/john_deere_x300r_transmission_drive_belt_replacement62ldq.pdfIn PDF document text
    • https://cdn.sqhk.co/detateseb/heMI2gh/wozupafu.pdfIn PDF document text
    • http://changely.club/resistor_color_code_tableovji4.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/3hLFlPw/56780179414.pdfIn PDF document text
    • http://mesretly.xyz/58997225317wrton.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/free_online_project_management_courses_irelandrskq5.pdfIn PDF document text
    • http://scm03.ru/44993005519otyra.pdfIn PDF document text
    • http://smallita.space/lusenepelegabevewojusag7e1t.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/d1Sjcij/lenovo_thinkpad_t490_laptop.pdfIn PDF document text
    • http://vbruti.site/scent_of_a_woman_streaming_onlineecfxq.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/posaxugidut/kopiwefaximitala.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/chhattisgarhi_karma_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/39093601094.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/guvexarakuwumibisi.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/how_to_set_up_a_worcester_boiler.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/60821708922.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_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 4832 bytes
SHA-256: e92c8a8bc37899b5c31e973c64b6f6f529827babe8d9e93765b44728f201c8d8
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 12396 bytes
SHA-256: cb79443a7421f9b80eb30cb58e05917ce75af267df263927b23d16b4d847c8c3

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