Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e4dbf8e5eafb55…

MALICIOUS

PDF

81.3 KB Created: 2021-03-07 02:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d8ce790969060813046c556a30565b7 SHA-1: 480ed963ff2115d34bd8bc7be7a931d9bb4cab77 SHA-256: 81e4dbf8e5eafb55add6402e60e088e806517718500f687567783cb4100e2b56
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially malicious content. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=where+is+the+filter+on+a+frigidaire+dehumidifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445754/normal_602d9c8390a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370543/normal_60077a14832ee.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/e7ojihc/fegujogitonol.pdfIn PDF document text
    • http://xozanos.iblogger.org/uffizi_gallery_online_guide.pdfIn PDF document text
    • http://creamwalls.space/badlapur_full_movie_hd_mp4f59nn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5ff454cd96368.pdfIn PDF document text
    • http://deutschebank-meine.com/ieee_830_template_for_srsv4m0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_601afe5a830ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6011c3847bbdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_602f78114fde9.pdfIn PDF document text
    • http://keto-menu.online/huffer_down_size_guidek4uhl.pdfIn PDF document text
    • http://makamar.xyz/nafegalojulamosotdf29y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_5fd86c242e305.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/WljfVw1/funny_videos_jokes_and_pranks_run.pdfIn PDF document text
    • http://airbin.top/general_durable_power_of_attorney_form_massachusettsiv70l.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/j7zpih2/27856089261.pdfIn PDF document text
    • http://xovuwut.iblogger.org/fiweruvote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pusujefizu.rf.gd/80978158544.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/nnat_test_grade_2.pdfIn PDF document text
    • http://luzigipo.epizy.com/32931866228.pdfIn PDF document text
    • http://pofazutufugu.epizy.com/kannada_movie_birthday_audio_song_free.pdfIn PDF document text
    • http://wedizakur.epizy.com/nanajutatupodinomavep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5216 bytes
SHA-256: e75f64c25073ae4bf328c62d7a16e349e5029e147d6a8b1cd60617d59fefb393
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10844 bytes
SHA-256: 9db3b2d006ca3e043f4d7fb41a6227382db8041bb5a9efe0c5b4cd36f13ef00a
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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