Malicious PDF — malware analysis report

Static analysis result for SHA-256 de897e2fb2c96862…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 16:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c138ff9e07eee15aedb6a1941008910 SHA-1: 41784c1ba313250bc85d019b6c701d63f97a2a3b SHA-256: de897e2fb2c96862772d66e271c1d69a81135d6b8bb66ce434740e77432971c2
184 Risk Score

Malware Insights

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

The PDF contains a link disguised as a helpful guide for resetting a Sony car stereo, but the URL leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+reset+sony+xplod+car+stereo In PDF document text
    • https://cdn.sqhk.co/vixukose/msjdsYa/3d_brick_breaker_revolution_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/Bjaqbha/rayman_jungle_run_apk_obb_mod.pdfIn PDF document text
    • http://opencabinets.xyz/batotimumojapavozunebkzr5.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/android_phone_data_recovery_online_free.pdfIn PDF document text
    • http://tehnoprom.org/pixary8o2v.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/108ac5fddbe.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/iS69bgi/crash_3_road_crash_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulojoduvos.epizy.com/refraction_of_light_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/aakasamantha_prema_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/logoniz.pdfIn PDF document text
    • http://zubeleboju.epizy.com/formal_vs_informal_assessments_in_education.pdfIn PDF document text
    • http://relumewamamit.rf.gd/literal_equations_practice_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/tofidewinovopufagepu.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/11567862206.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/69749804157.pdfIn PDF document text
    • http://ludilisi.epizy.com/mlp_cheese_sandwich_color_guide.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5292 bytes
SHA-256: 6fd85b0e60013746855e5f91d13f2531cd9a7fee58d38800c2d9bb291cefdaec
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 9824 bytes
SHA-256: 3c06e1f860d28335d7226f77ea473aff6123fd6e015bee26c8372338cd357ba3

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