Malicious PDF — malware analysis report

Static analysis result for SHA-256 0124a536a458ae22…

MALICIOUS

PDF

74.6 KB Created: 2021-02-17 04:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a77e3e8c86da572742a67a34ec90d69b SHA-1: 54b70c8d657e6584633c57a69e7881a36c6a7b83 SHA-256: 0124a536a458ae22e144d48238b5ef208f374fa466f629f066fdd8b1ac9fb5be
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded links likely serve to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

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.
  • 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
  • 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://crophysi.ru/strik?utm_term=yahari+ore+no+seishun+rabukome+wa+machigatte+iru+manga+online PDF link annotation
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/buzimu-ruterete.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/xevomebasamala_fezovazugeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5fe14c86198c7.pdfIn PDF document text
    • http://goodxday.xyz/32951179452ns636.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/122c81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5ffb14ed7aaf7.pdfIn PDF document text
    • http://expressday.online/cow_jumped_over_the_moon_song_lyricsp3m6w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_602ab86d85991.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/dakulanof_luwajukukatulix_modazagamisuga.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/nazuxubelez.pdfIn PDF document text
    • http://cashbackk.site/fanuc_ot_parameter_manual_download96qv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcacf021dc66.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/somoxod_kexixolekezaw_kenavinedux_nozewumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_601d6bf4ad98e.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/5020409.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/tuletivotarupu/foxukosixozunotofovukoge.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/graco_baby_monitor_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/bacteriology_lab_report_sample.pdfIn 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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 4540 bytes
SHA-256: acb30591320059503e81c9448a7a59ff7965f4fef92c97063b1bd214530e8c42
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 5468 bytes
SHA-256: a12d08fa7426c006a81dae5c6d3f1d32bd45afcf1685b18214f7e648735bdc03
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 10736 bytes
SHA-256: 136b629e1809a29f2ed5428176a0b9552a7ee7debee8dcd841c7e6ace0d9a7cb

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