Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa486067ae3cd48c…

MALICIOUS

PDF

91.1 KB Created: 2021-02-24 13:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2deaf42e47ab7402c83782e24b2966a6 SHA-1: 7fe331551b8161773781b2225e20a06dbcdd8935 SHA-256: aa486067ae3cd48c80e4e06cf4d6dad21a2a4c76372f22c56f12fd5fb597ca14
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=ncaa+division+2+women%2527s+basketball+rankings PDF link annotation
    • https://cdn.sqhk.co/famuxina/Wiijehj/gyro_boss_dx_switch_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fffea64b4fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6032204a439df.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/49877902010.pdfIn PDF document text
    • http://brandframeb.com/944359878570n11d.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/HWiahjf/pictoword_level_580.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/oid19jf/lokefuvan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601dce23d98a0.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/r_k_college_full_form.pdfIn PDF document text
    • http://espacecmb.xyz/rebodufuqdcs8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fe24e481385b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fed342fe7625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9eb7762ce.pdfIn PDF document text
    • http://itslm.fun/animal_crossing_ski_resortlhxse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/saninu.pdfIn PDF document text
    • http://tipujujidudig.rf.gd/cinema_apk_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/3068535435.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/vocalist_lite_apk_full.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 5752 bytes
SHA-256: 63c7335704f724299e9e716b7d79d8a28cc12579711a56472a001dc17f644afb
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 10612 bytes
SHA-256: 8caf5b80d415ff2b37f5d2e06098531260392e618db72bb5aa0a3f1ce9b23c9d
font_03_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 11336 bytes
SHA-256: 691bd025be9635fa1d9521c7a4a25e591f4ba5993aa8bcf97141c45577fb0d17

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