Malicious PDF — malware analysis report

Static analysis result for SHA-256 816689f8ba22d6ad…

MALICIOUS

PDF

73.2 KB Created: 2021-03-02 17:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 55384b77e156577469cf903b8ad7a09a SHA-1: 4086b954762ad291f053c88f11a91480d1e09376 SHA-256: 816689f8ba22d6addde23fa14475a49eba10e6b3d255ec550fc85c2a2aa65d89
224 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and suspicious domains. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=ingenuity+inlighten+cradling+swing+phoebe+weight+limit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc68e4221f81.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/708457511077dfj8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fc9cb98155df.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/botekifuwam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fe4853fe6b8c.pdfIn PDF document text
    • http://govejulij.22web.org/nenedukaver.pdfIn PDF document text
    • http://sfr-webmail.com/mowuwudewuboritudz1cx3.pdfIn PDF document text
    • http://hookup666.site/arcane_mage_leveling_guideeircn.pdfIn PDF document text
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/zibatafisudubosoved.pdfIn PDF document text
    • http://cloudplay.xyz/kibevosigatonojovomemakik51kio.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/fasiwi.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/wemovurokap.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/timadopobupupusaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufamopo.epizy.com/bts_love_yourself_answer_her.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/sufesetumegebutesaledu.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/one_of_us_is_lying_audiobook_google_drive.pdfIn PDF document text
    • http://jowelipap.epizy.com/pujomugidejes.pdfIn PDF document text
    • http://tujolelulovowew.rf.gd/classroom_management_plan_template.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/ejercicios_notacion_cientifica_matematicas_3_eso.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5756 bytes
SHA-256: 62d37061439d993dcefc7a3047df7d5273472b48b8ad15e57e0b48ef5ab7660a
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10312 bytes
SHA-256: 22207cbe9195cf758667438b59836261f4d02f65339e03c2bbde6860d0e49d99

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