Malicious PDF — malware analysis report

Static analysis result for SHA-256 728030f89fb8ab19…

MALICIOUS

PDF

79.7 KB Created: 2021-02-03 00:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04756a62cff04ef984996c7c271ea690 SHA-1: ac32642d7ec7cf04a5bc9b1222aaa4921b0fadd1 SHA-256: 728030f89fb8ab19fe1f9865074057abef0843f75c4b318b43ea86aedd1fea14
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

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
  • 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.
  • 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/wb?keyword=shazam%20music%20finder%20apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454691/normal_5ffdcd66161e0.pdfIn PDF document text
    • http://gobigs.space/xuxezujudulepodotoletfafo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fcf59a63c601.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/kuwod.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/ctP0zFT/basketball_kings_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5fc9d9daca77a.pdfIn PDF document text
    • http://rat-red.space/make_ice_cream_with_almond_milkkh0iz.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/iyic4ia/how_to_redeem_roblox_gift_card_from_target.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/komerijilotagikaj.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/Thh9icw/dream_house_days_money_guide.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/vikuwoma.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/pohagdm/farming_simulator_16_mod_apk_android_oyun_club.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/lowexinofuknze.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/d4cbbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6019cb8f5bc42.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iftRhjY/53958151209.pdfIn PDF document text
    • http://gmetry.online/68851457018d3jpr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 5580 bytes
SHA-256: 1b61cd0e22c9d00972ea92790e0e98e3d1e4ce094138131ddb7d2b3c4da8d0ad
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10344 bytes
SHA-256: e5ad8e3e9aed9e346e3cf91f071b13137047fa49714768450b7ea6814043c253

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