Malicious PDF — malware analysis report

Static analysis result for SHA-256 f252a34353d133e2…

MALICIOUS

PDF

72.5 KB Created: 2021-01-26 23:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0a0f15eb786708464a9d886374d6e83d SHA-1: 4ea20976edfea77d1fe3f5db5f375029e8cae804 SHA-256: f252a34353d133e2da6b4ab81c0c0186e90e65e1c95c576dbc9aecad06821595
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to 'subtracting integers word problem' and embeds multiple URLs, one of which is directly referenced by a heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=subtracting+integers+word+problem PDF link annotation
    • http://itali-big.space/mr_love_queen_s_choice_walkthrough_gavins9cat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ffcfe5762071.pdfIn PDF document text
    • http://mmmuuuue.space/video_player_hd_apk7rfss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_5ff6c608d1f3c.pdfIn PDF document text
    • http://dunetetemob.22web.org/tracing_alphabet_words_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fcae5116b629.pdfIn PDF document text
    • http://topstop.site/320801199481ixg3.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/jagghih/ninja_runner_game_download_apk.pdfIn PDF document text
    • http://kurs1.xyz/kevlar_hockey_socks_reviewpjwac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fc9b93118105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5ff915fa7ddb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417809/normal_5fe600f197804.pdfIn PDF document text
    • http://priz24.site/how_to_unlock_zombie_mode_in_pubg_liteok7ea.pdfIn PDF document text
    • http://digtalcaliper09.xyz/9763695361272rub.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/lhhchhq/kiduwenisuxigurawap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_5fe394c5b9f2a.pdfIn PDF document text
    • http://opit.space/birdman_hand_rub_meaningh5cfe.pdfIn PDF document text
    • http://xteenware.online/english_reading_comprehension_exercises_grade_8uabk4.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/XbR3gfZ/vebewemub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regipikiwubadov.epizy.com/fomasewisete.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5728 bytes
SHA-256: b853ec419f7728864b0cd9b66a4a95c094c77191df78be3738bb256c5a3ad3f2
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 11340 bytes
SHA-256: 4bd217393de6dbe45d3622691d476561812bb982a025ccce61b446b9e6147481

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