Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c316ef6f3ddec00…

MALICIOUS

PDF

78.2 KB Created: 2021-02-19 00:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 06d8803096cbb041be3dc798af8a3731 SHA-1: df28a374c686241c4fb7c99707ae4688888b4181 SHA-256: 2c316ef6f3ddec0026dfbd51636250bc291bc6c3308733b2936b3132f0b28741
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=literal+level+questions+examples In PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fc989abf001d.pdfIn PDF document text
    • https://cdn.sqhk.co/jivuzukop/gPghNSq/jibjab_happy_birthday_gif.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/2545076.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/mewituxawafal.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/uk_visit_visa_application_form_from_usabkmax.pdfIn PDF document text
    • http://drenajkrasnodar.ru/158730756m12f3.pdfIn PDF document text
    • https://mufabevazom.weebly.com/uploads/1/3/1/3/131382955/juxixuzozisuvim.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/fhehhjj/linear_function_examples_table.pdfIn PDF document text
    • http://ihsteam.ru/hd_wallpapers_for_jio_mobile_1080pumeob.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/TOyh2Fm/silelibesajunimo.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hsibtyC/13154501557.pdfIn PDF document text
    • http://7lessons.website/84900861292iq81a.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/3836006.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/ladiwuzetawedi/moburevikidikuda.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/gokexiwobari.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/altezza_rs200_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/31402343091.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/chahat_ki_barish_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/smoking_attitude_status.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/guide_intrants_agriculture_biologique.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/glencoe_geometry_chapter_1-_5_answers.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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5160 bytes
SHA-256: 2e6d9b1451daf557d878641a7b28dc258fcfc9d5e2ba5463199a98e1de5aa00b
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 10852 bytes
SHA-256: 54f65b831b00f0b0354044f840bb9bad8ebe4afdc04eb1cfcdbfbedda3f6aff4

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