Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1397fcd664d1c2b…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 10:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8dcf2af18f18e03940d77d383e75aa00 SHA-1: bc583b71711fdc0f8162255b864e85aaccaa4dbb SHA-256: c1397fcd664d1c2baa9e50938be5ed351a3fca8636f88efd8e28bd55ec895942
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using search engine optimization techniques to disguise malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://dugedepap.ru/wix?keyword=find+the+lcm+worksheet+with+answers PDF link annotation
    • http://film123watch.com/best_6_quart_slow_cooker_recipesn7d55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff5075ba2ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_600749f268518.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/60977405095.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/precision_agriculture_technology_and_economic_perspectives.pdfIn PDF document text
    • http://1-bog.ru/20613855853aj60d.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/senijigovajasubaak9t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5ff339001261e.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/present_simple_verb_to_be_exercises_elementary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff19add7fdf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_681101d6e2984950b9f8aede01b9e9ea.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_504031aeaf114ef8a1ff12506d381be2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/zuwavegimotunuveta.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_3bf74f3f0cb14c49b356420a601b08ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/54364785759.pdfIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_d42d463e52d94a8d87a0230afdeeaa24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/74118190548.pdfIn PDF document text
    • http://tiwedozesa.atwebpages.com/cantaloupe_island_piano_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/how_to_connect_to_time_capsule_via_ethernet.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_e20cd71bc3024f4987f06edcbc17da90.pdf?index=trueIn PDF document text
    • http://fijorolur.myartsonline.com/aflac_short_term_disability.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_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 5292 bytes
SHA-256: 2f4b1409f706638056afccb0ce091298e6fd9513505110bfa2e3e5d2987d06af
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 10764 bytes
SHA-256: 7deec295ab121ab00f1398224bebfe9269c83a332cdb8e75a71b5fdeb982d001

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