Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ee80e7ca8cdfe…

MALICIOUS

PDF

76.8 KB Created: 2021-02-15 17:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 12752af8048abf869ba575a4f6d1df75 SHA-1: e64929bed7f6b9133ae76550f2f9238ea5272259 SHA-256: 990ee80e7ca8cdfe0ad13d2daf871201e1e26b530de2968d0688f05d095a5240
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links, and one specific URL points to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content or download further payloads.

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 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.
  • 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/wb?keyword=is%20evening%20primrose%20oil%20safe%20when%20trying%20to%20conceive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fdc1cd76df46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_5fe6bcc8d58ac.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/248c437d788.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/de5ubSW/exorbitant_amount_synonym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fc61d5448e41.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/gj7gejb/zesikuvaduxeseko.pdfIn PDF document text
    • https://busununivid.weebly.com/uploads/1/3/4/7/134774072/b0ea1acb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371267/normal_600839ab84e85.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/AjhewX4/pi_music_player_2._6_6_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/jdA4hhd/88332421228.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/gixawetopoli/backuptrans_android_line_transfer_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/asphalt_9_apk_google_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/windows_10_version_1903_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/clat_2019_answer_key_career_launcher.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/solving_algebraic_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/75656300328.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5620 bytes
SHA-256: 26d46ff1f9e053e5412c12df51cf3c5eb9f1c7286b4d404ab8fe6448970951ee
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10740 bytes
SHA-256: 4b9f35b59eeea82131c0fa290144ad71cb94d7abe9d44b9191314270a166c5e5

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