Malicious PDF — malware analysis report

Static analysis result for SHA-256 df035ecfc9c187d5…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 14:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a6ab0e34b34d3514030126661daa53b SHA-1: 8a563ea51a0747cffdd2d295a2c96a80a4602a4b SHA-256: df035ecfc9c187d565e7633c21634d000697ec6a5e4eb467fc2b4a9e5df196d8
194 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 of which are part of an SEO link farm, indicating a malicious intent to distribute content or redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this is a phishing or malware distribution lure. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8573

Heuristics 5

  • 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
  • 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://nipisod.ru/aws?utm_term=the+witcher+3+100+completion+guide PDF link annotation
    • https://cdn.sqhk.co/wogebebaruro/KFlhcgi/35837256702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_6046d59c97d67.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/iiaibIZ/debesaduzebuzivokitevema.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/2312628.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/valivuf.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/jfyejc3/zigejigomelegudutovudez.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/busosoxodisolu_tegaz_nuvaxiwab_riponij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5ffebf0bb0c55.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ghB8ghB/best_mountaineering_boots_for_wide_feet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_604d1755d2f65.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/NTihqxR/gi_sticker_for_whatsapp_2020.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/dixaleko/unstable_angina_aha.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_d0892a2f5166486590c101c6f673458e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/fyi_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/starcraft_heat_press_company.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_29fa2240ce324eea8e0b1228a769651e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/asme_pcc-_1-_2010_free.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/bible_word_search_puzzles_printable_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/record_instagram_video_hands_free_android.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_934d20797a1c4dee87ce53af748866b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/75471448385.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/58639393787.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/vcds_lite_loader_exe.pdfIn 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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 5500 bytes
SHA-256: 1e1572b26743ed6241d7fcca548f8bc78ad282b6e5edf386e3cbebadc9744372
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 12444 bytes
SHA-256: 713dc027c5b88d22faaf7afd6bef348da69dbcece6e8af95550cc562b539f437

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