Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf1dd6794d87ce4…

MALICIOUS

PDF

91.3 KB Created: 2021-01-23 12:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1267b4467c0aed98839a1dc1d12ae586 SHA-1: 9cedc2303887fab802af3dedb0048b4ea2853333 SHA-256: adf1dd6794d87ce4513615f99592fb7b6c67b691f675a0e642738f3e9e1877dd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. One of the primary external links, 'https://trafficel.ru/aws?utm_term=bsc+nursing+application+form+2019-+20', is associated with the lure of a nursing application form, indicating a phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=bsc+nursing+application+form+2019-+20 PDF link annotation
    • https://site-1247550.mozfiles.com/files/1247550/7631101883.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/brgckgd/voxal_voice_changer_registration_code.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/morejebesajetos.pdfIn PDF document text
    • https://site-1173582.mozfiles.com/files/1173582/nixiwebilafovu.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/hgjg1jb/sniper_video_song_download_mr_jatt.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/ahbTgdD/xuwefonadonatafebolebo.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/legopamisi-voxiniwebisos-getonuj-gudajezu.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/nqih2ji/simply_piano_by_joytunes_itunes_store.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/xipubofuruwiduta.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/Xjg5vie/sim_card_information_by_mobile_number_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/dXhhjiF/warhammer_quest_blackstone_fortress_no_respite.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/xupizewuxere/merry_christmas_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/34457401636.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/36904335215.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/juwonawig.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 5900 bytes
SHA-256: 4b845d744e9a8f5f0104d49ed1a0f9700bf55f1f1d48097914e7b80505baf0a4
font_01_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 11548 bytes
SHA-256: fd8d0fcb21325ca0e952ff66a49a234eb33958c67ee7d420c219a123bba9d4c5
font_02_sfnt_off00014a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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