Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f93a66e9c92bb8c…

MALICIOUS

PDF

69.9 KB Created: 2020-11-26 09:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e344eaefc2418794409ed582c6cb4edf SHA-1: bc4da0b434b8dd75023f069accf1b5d5d91e3398 SHA-256: 7f93a66e9c92bb8cebc042769a44781ca818cf394982486de4ef32548ed0c7e7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a PDF link farm. The primary malicious URL identified is https://cctraff.ru/123?utm_term=apush+chapter+3+summary, which is flagged as malicious. The presence of a large number of PDF links, including one pointing to s3.amazonaws.com/sajatesawodiji/xasinoxo.pdf, suggests an attempt to manipulate search engine results or distribute additional malicious content.

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
  • 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://cctraff.ru/123?utm_term=apush+chapter+3+summary In PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/lupetuk_fosokasadamux.pdfIn PDF document text
    • https://patodenum.weebly.com/uploads/1/3/4/6/134657208/pemisuj.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/zuwixujobusozevikoro.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/gusatevepope.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/fe6ebc1284e6.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/5343069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/xasinoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/94706053764.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/functional_skills_level_1_english_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/angel_season_4_episode_22_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb0386a-163a-4cf3-b2d6-f1930311a958/tezejakako.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/59549059173.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/singh_is_bling_movie_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/8587910083.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_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 5012 bytes
SHA-256: 94b227bec49fa67bc1378e80e0684d777bd3a50e5f600bf26498612b09c71e96
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 10052 bytes
SHA-256: 40f55dec76852c1080d27fca5a926f192d806026c19c2706669562813a53b9cd
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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