Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed38550a007bb3a3…

MALICIOUS

PDF

79.4 KB Created: 2021-02-25 19:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d039a11501e445f89692019bf0780f3 SHA-1: 7941f6a5b5adeb9fa311a30ffb37c399beda7b39 SHA-256: ed38550a007bb3a3fe3d886f0fb3b9cf4ecaa9549d5da8e549f2fe023c32879a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=excel+practice+sheets+for+beginners' and 'http://luchdobro.site/what_is_the_purpose_of_north_atlantic_treaty_organizationmzak5.pdf', are likely used to lure victims into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=excel+practice+sheets+for+beginners In PDF document text
    • http://luchdobro.site/what_is_the_purpose_of_north_atlantic_treaty_organizationmzak5.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/1gBjije/seruvajo.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/64f37591729.pdfIn PDF document text
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/63ed3c7a70.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/how_to_lose_weight_fast_with_indian_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/16rHEdi/moviepass_news_latest.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/the_killing_joke_did_batman_kill_joker_reddit.pdfIn PDF document text
    • http://punejew.mygamesonline.org/franny_and_zooey_salinger.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/majarawunajojasijomigej.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/gumegulaxi/teaching_english_as_a_foreign_language_free_online_course.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/vosol.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/wulusaxibegasosodojapama.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/can_i_negotiate_rent_in_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/japan_cherry_blossom_2018_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/memes_brasil_stickers_whatsapp_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5440 bytes
SHA-256: c590921b292471a03b82094ca9dedcd55eb7e3d5520b68c594210cda3760deaa
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10868 bytes
SHA-256: b8ad8dc58bc50eba6aa171fff28261082a681d48b8bb65f0ee76d1a273b538b8

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