Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0df22788cecd046…

MALICIOUS

PDF

95.9 KB Created: 2021-03-30 15:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31ecc6db0c4bccec536374432c9bad0a SHA-1: e632c537cb6d6f8fc0d67d38bb0028b8ea83cfa5 SHA-256: b0df22788cecd04656449fd0164fd62fd076b817f462591e0a27b5a3ffc2d6ce
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, with heuristics identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bologen.ru/award?keyword=c+s+lewis+miracles+pdf PDF link annotation
    • http://ferebamof.22web.org/cellular_biophysics.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/ijhib7J/flying_birds_gif_png.pdfIn PDF document text
    • https://sudejija.weebly.com/uploads/1/3/5/3/135390998/lozigus.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/ighCjct/call_of_duty_free_apk_obb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_601d061af140c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_60405d8066225.pdfIn PDF document text
    • https://lasarowolu.weebly.com/uploads/1/3/6/0/136024073/zegoxavanazajag.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/cb3b13fd683b11.pdfIn PDF document text
    • http://sifusebidokud.iblogger.org/dewsbury_reporter_newspaper.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/Ggjfjci/live_price_crude_oil_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_60100115d4cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/izVgjZg/chemistry_diagnostic_test.pdfIn PDF document text
    • http://tedujutof.iblogger.org/asturias_note_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_6032f98d1c51e.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/dotaso_supebelufoxitik_sejekegisudisu.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/df6301e8bbb.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/ib4WjUY/jikagokivokupukesisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5ff850f9147fd.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
    • https://s3.amazonaws.com/tuzamada/costco_uk_offers.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/dajerujosured.pdfIn PDF document text
    • http://vexeger.rf.gd/android_go_os_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/88297867091.pdfIn PDF document text
    • http://dixediw.epizy.com/bexusopuniluwumabofe.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/chartek_7_application_manual.pdfIn PDF document text
    • http://zutibebasonuf.epizy.com/bawijixavumavusi.pdfIn PDF document text
    • http://rexawisoza.epizy.com/unspoken_feelings_of_a_gentleman_2.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_off00012bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 4908 bytes
SHA-256: 8b213f4c95e5ee9d87312b558e9ced93b88939953d2171dc234bd78a04ff4565
font_01_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 11112 bytes
SHA-256: 0a2b3802385e8422db7b41a5d4597af398ca517c72b9471f1e5bd42cfe342750
font_02_sfnt_off00016268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16268 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e