Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e3a2311e4db61…

MALICIOUS

PDF

75.0 KB Created: 2021-03-17 02:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b92f7388b66e3be97467585d65e5342b SHA-1: 153bd2d13c2cf385db19ec9f2a9a99b244109ae5 SHA-256: cf7e3a2311e4db61d62de39e088ed8d8d0ee15afed6552c799eab9c7274d1f3f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://mezovuduw.ru/123?utm_term=balakrishna+photos+ing PDF link annotation
    • https://cdn.sqhk.co/rolileduvof/WhbjbZv/14880263703.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/1367556.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/muzinosepo.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/EgheLEA/traffic_rider_mod_apk_hack_free_download.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/a28138b.pdfIn PDF document text
    • https://bozuwamit.weebly.com/uploads/1/3/4/5/134527300/8013365.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/ygechgg/whatsapp_sticker_maker_android_github.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/fuperunenewel.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/map_of_europe_1939.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/gelawiweza/b._ed_ignou_exam_form.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/kowetaz.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/movies_website_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/birthday_greetings_with_photo_editing.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/womewifivabezari.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/do_you_want_a_nature_metaphor.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/why_is_50_shades_darker_not_on_netflix_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/easy_cocktail_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/96105271661.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5196 bytes
SHA-256: 2e479e89ff8f431eded0462a808c2a3c8562672ef779d2a0807258239b327dfd
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 10576 bytes
SHA-256: 641a4438f24665ddd57edb1873f1fbc33b20667ae0deaaaab0cb842709f67ca6

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