Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1918e1226d39a7…

MALICIOUS

PDF

75.9 KB Created: 2021-01-28 15:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2768e1db3e30b4d24778dbffa37d0dc2 SHA-1: 751626b8aacc43eee1cb205953d91a2d51a1ed68 SHA-256: 5b1918e1226d39a712fa563d35abfa7c07be7c2250f37c665e3b7d98b698a35b
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a high-confidence ML classification. The embedded URL points to a known malicious redirector, indicating an attempt to phish or deliver a payload. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

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
  • 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.
  • 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=avon+lake+public+library+staff In PDF document text
    • https://cdn.sqhk.co/jigavozef/cijjib8/82645027828.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/aZRBgd7/shake_shack_menu_prices_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/dBFAM7D/wizijele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416128/normal_5ff509b602ab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5ff448efeb5aa.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jbf8hbk/word_of_the_day_app_for_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/gdpejbi/mountaineering_tent_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff94c45e7f22.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VHOXghF/68867916918.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/jjhiJjc/lotuvalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5fee816f55935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ffb9f60ebb70.pdfIn PDF document text
    • http://sudesisobibimit.22web.org/32617936400.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/febopa/xutolilefojox.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/fusebogexaximelodipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/vidimapulapalemodekinida.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/21140394361.pdfIn PDF document text
    • http://jilovin.epizy.com/credit_check_authorization_form_template_free.pdfIn PDF document text
    • http://dowupozor.epizy.com/action_research_in_mathematics_education.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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 5248 bytes
SHA-256: 38c5d1b343ad9d9bab568e6f2b66adf5793c8e74dd01ad14d170b2ec9fca2fb5
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10564 bytes
SHA-256: be53e53e652cd068adc1c20669facdeb143ea8c6f51059c33636355f8dda8c6a
font_02_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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