Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bfb9a5a9584df7…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 22:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8fe17b088d7762fb22a77b5a2d6d1519 SHA-1: bb8b9d9a99659273786d09178c84064aca6b9b50 SHA-256: 79bfb9a5a9584df7f19b80cf6553e04df68402a40800b0275e607a17dc9f5bba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a book summary, which is used to direct users to external sites.

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
  • 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://jottigo.ru/123?utm_term=a+different+mirror+a+history+of+multicultural+america+chapter+2+summary PDF link annotation
    • http://graatorama.space/best_online_games_for_android_mobilevo3tm.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/wemazezezanisulibwr85k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417308/normal_60094e6613a48.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/bujivulugoguzobilekih90t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_6005918f8e82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_601936d19e467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fc6f1cc7eaa5.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/1416329.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gdKghic/31923975640.pdfIn PDF document text
    • http://reduslim-italia.website/what_does_chit_mean_in_thailandi78y5.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/bisapovepizaj/51548624160.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/the_beatles_wallpaper_android_hd.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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 5620 bytes
SHA-256: 03b086a62b1f4ab40624bfc07d03515264d4979e6801f7442c11b8eb2055c689
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 9960 bytes
SHA-256: a117c203d93a068f59f00063b0b8d307d1363964ea5bc0775765efed5da8d785

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