Malicious PDF — malware analysis report

Static analysis result for SHA-256 337c89b61622e6d4…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 21:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 56d45caa48910631d097629a87b41f19 SHA-1: c083d2db187bb5f93ed7d7b7afa5a048e4f4620a SHA-256: 337c89b61622e6d4eda6947fc49f007b4246f3d3deda0b88c9837f6b5d42d69d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors, suggesting a link farm or phishing lure. The presence of 'Pdf.Phishing.Trojan' in ClamAV detection and ML classification strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=hyderabad+pitch+report+today+match PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409107/normal_5fcfa6bc13ad8.pdfIn PDF document text
    • http://azorocheat1.xyz/ukulele_songs_simple_chords6665w.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/3161871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60479d184fe4c.pdfIn PDF document text
    • https://lonomunemol.weebly.com/uploads/1/3/6/0/136082408/zikakugozoza_penefurefowox_namadexisaf.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/bolufafanix-xabidixakufe.pdfIn PDF document text
    • https://megulotajisotem.weebly.com/uploads/1/3/4/5/134592592/juzakanup_wajugedanuzunik_nazagizofulum_wajodazuvuwu.pdfIn PDF document text
    • http://fc-aromat.ru/14730472602bnwm4.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/4520316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_5fdafd589c6da.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/andreas_moritz_death_wikipedia.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/pasawexawinogad/tcp_ip_protocol_suite_behrouz_a._forouzan.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/celluloid_malayalam_film_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/49082490021.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/guess_how_much_i_love_you_bunny_name.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/nolapeduxabebipupuxuzuji.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/sakikep.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/what_are_the_purpose_of_technical_report_writing.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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 5304 bytes
SHA-256: e0b9c33fd09c2b16c8c448b5f1ea0e78fea5b67f8bc7c815eae548f207308923
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 10544 bytes
SHA-256: 6af46a8e2acdb8782c340ea3776cb46a6baa1da8f5733a7ed4f17b3d7d07c328

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