Malicious PDF — malware analysis report

Static analysis result for SHA-256 3581cddd7d84dc66…

MALICIOUS

PDF

93.6 KB Created: 2021-03-16 20:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: effa57b0f355e8a0efd5ada9bf8097b4 SHA-1: 56f5e52f92acf056cf38d824a764e52a31d07641 SHA-256: 3581cddd7d84dc661b355c09e35586208b03f3b8fd66c8c2e79724426b038302
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and includes a UTM parameter suggesting tracking for a phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://jumiwimov.ru/123?utm_term=daihatsu+charade+g200+workshop+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/gibuzini/jVXjchh/batman_comics_wallpaper_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/tpjbjeK/dotagivuxeputagufu.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/b3jfPje/bubble_shooter_game_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/jdhafhi/25929102109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6031929a8bab2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5fed06b5d0321.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/eieSgg8/cannonball_run_record_car_2020.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/diruluvakarowizemupe.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/TrIOjaa/mulumuvatesix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_6034447738832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_604400f65903e.pdfIn PDF document text
    • https://pobolibawawo.weebly.com/uploads/1/3/1/4/131437087/maxesefex.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/Vgfijgi/dikusozesazidoweminebemo.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/jijfWJk/3137641939.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/jfIhagc/vawimanikologiwufijaxixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_604db4dd2d86c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_8489754825df4e659dd984a985858ffd.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_60aaed53777049d6b0361dd904b23d67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/corticosteroids_davis_drug_guide.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_8631d9975ec94d6eab396960ec67ef43.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_f82d18b212934aba8ca0d308b055805c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/niteka.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/77056903675.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/jimefovozutuniw.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_36fc9429ee7a4848b7e4aecec07443f9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 5996 bytes
SHA-256: 5446dc3635be2243f44100fdead685ba9fd02ebe371a69b45be225b20fe49cf7
font_01_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 10900 bytes
SHA-256: 4b48087c494156bc502f485e7cd0f838aaaeb6e8ed16c23d2d27a8de9c1098c9
font_02_sfnt_off00015375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15375 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd

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