Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef66025f3a078a8…

MALICIOUS

PDF

74.3 KB Created: 2021-02-09 18:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2e7987ee35843d6e1831ad09f919d23b SHA-1: 2aba8bbf1fe50e69d609d53ab1ae47f1bc9be4d2 SHA-256: 2ef66025f3a078a88f05f918e298894b3326a8e5d3dc06b8edc4a4168d72b814
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=anyong+lupa+worksheet+grade+1 PDF link annotation
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/639167.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/icStWij/video_player_for_windows_8._1_32_bit.pdfIn PDF document text
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/nejidemep.pdfIn PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/gikojitanab-sururerazadabu-xinezaj-fukelawo.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/l9hjigh/pakorat.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/wurof-lofopowa-saduto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_601efff122ebd.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/gjjghaF/space_crew_gameplay.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/jikedurujiwam-xopexuduret.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/lurutibikuvesu-nitogifu-mofuwomoda.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/vjhgige/dudefur.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/jengfPI/vovowoxupaxife.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/hiaiaz5/bible_stories_for_kid_youtube.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/xalexojaxipud/dalibukalesatimaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/fezeni.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/delhi_police_admission_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/bronchial_asthma_ppt_free.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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 5520 bytes
SHA-256: 69419067982bbfca3f4ffaf76072bb29bad982eca78e2f54be4d18c1db61fc86
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 11540 bytes
SHA-256: 19b5f02fb04eb39fa6ed787895ee1e92be79349b0335832af9c2052a13e0e505

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