Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9005f8c9401be23…

MALICIOUS

PDF

77.2 KB Created: 2021-02-17 01:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7b656999dce42e6065b3bcbd6c044973 SHA-1: 48050eeef57cd2adc3b2a344bfe40a7d81a9a74b SHA-256: d9005f8c9401be2394ec048e7746a3c51ecc12ad73b18bfcceb2b1a305fe008d
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 point to PDF files with potentially malicious or SEO-spam content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/wix?keyword=comparing+market+structures+worksheet PDF link annotation
    • https://cdn.sqhk.co/zasemewiti/INdlhhO/rome_total_war_barbarian_invasion_units.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/5466299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368736/normal_5fede9bb1e066.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/GgYDjce/nukogejifufejiwelis.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/jjfij4E/trial_xtreme_4_cheat_my_way.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/cXjjiew/ruvibulelu.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/T4Rhehc/speedometer_apple_watch_face.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376358/normal_5fcb25d173d10.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/gchiihF/monster_e_co_meme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/YjdB5Yw/death_invasion_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5fca33b182298.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/gamawuwulivaxew-desarinuvopad.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/jupudizadid/54135883492.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/credit_report_explanation_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/barking_abbey_school_6th_form.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_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 5376 bytes
SHA-256: 6e01b518496479fe0dadacfe69ee1d44a8188ca74518972f2ba4a2b34945598c
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10704 bytes
SHA-256: 7873561f93442ba1e4f703b59b546cccf30a3ae3d80a45176d472dc994ed6717

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