Malicious PDF — malware analysis report

Static analysis result for SHA-256 970cb9f590aa8c09…

MALICIOUS

PDF

81.4 KB Created: 2021-04-17 02:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a1eedacdd1c9fa1c3b676d4dd3bcc095 SHA-1: 5e904ad1641a538634433decda3ae952f6a35279 SHA-256: 970cb9f590aa8c09b7a4a82fef8d5af70197b3755453500cfe4d06d6b8abd26f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The primary malicious IOC is the URL used in the lure, which redirects to a potentially harmful site. No scripts were extracted, but the PDF structure and URL indicate a phishing or malware distribution attempt.

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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=longman+academic+writing+series+3+paragraphs+to+essays+%25284th+edition%2529+pdf In PDF document text
    • http://xejopegig.mypressonline.com/cbse_grade_9_english_textbook.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/navitubuvetamuzu.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/91885602680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_604fb5ab78de7.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/5188042702.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/what_does_straw_man_mean_in_language_arts.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/mass_effect_2_manual_xbox_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_6041bcb839d3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fefb80baf74b.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/pulse_width_modulation_inverter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagijonegularol.myartsonline.com/morpheme_morph_and_allomorph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388659d7-1e87-4ae0-83e8-4317de10a748/romeo_and_juliet_star_crossed_lovers_scene.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/81262569736.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/8978001752.pdfIn PDF document text
    • http://bupalim.atwebpages.com/retinopatia_diabetica_proliferativa.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/wulebonanededasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7476c81-9e40-492c-9bff-03763292db65/68444857937.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/best_video_editor_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac63d13-8b5b-45c1-80dd-b95a59919670/68750538673.pdfIn PDF document text
    • http://tudugir.atwebpages.com/favuze.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_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 6080 bytes
SHA-256: 487fa5467b4512821a6b240585272e81a98fa65399dd0a79509058bf92df59f1
font_01_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10212 bytes
SHA-256: 52c3cc17582c43a603cae79b6ffc5df9b097fa5c6c35bfe4df9248f28f955966

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