Malicious PDF — malware analysis report

Static analysis result for SHA-256 9437cbd0a6b69a0f…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 09:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faaeb63c5106f5d66716d3e644b44f0c SHA-1: a842f7c99b13262ba87e83358c6a4c309d833cf1 SHA-256: 9437cbd0a6b69a0fa6adecf3e9bf1e9d7869f944d0fff4902bed5d52f2b51f61
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary URL, https://botokaw.ru/123?utm_term=arap%25C3%25A7a+harflerin+okunu%25C5%259Fu+ve+yaz%25C4%25B1l%25C4%25B1%25C5%259F%25C4%25B1+pdf, is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=arap%25C3%25A7a+harflerin+okunu%25C5%259Fu+ve+yaz%25C4%25B1l%25C4%25B1%25C5%259F%25C4%25B1+pdf
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/3591837.pdf
    • https://zitasiga.weebly.com/uploads/1/3/6/0/136088478/bfc666125e.pdf
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/1236736.pdf
    • http://visebadegu.iblogger.org/92032289398.pdf
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/2418134.pdf
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/9905322.pdf
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/wumojuwu.pdf
    • https://suvamowifav.weebly.com/uploads/1/3/4/3/134351486/setevetiwititu.pdf
    • http://takavejesutep.iblogger.org/vowizomiriladajevu.pdf
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/jepano_vabukutitirelow.pdf
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/7534361.pdf
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/18eca1b0f.pdf
    • https://cdn.sqhk.co/keridola/5jh8ift/chinese_language_dictionary.pdf
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/6099134.pdf
    • https://cdn.sqhk.co/ditetona/geRgclR/71806276406.pdf
    • https://cdn.sqhk.co/pinuwinepasu/Tjghhig/ap_computer_science_principles_exam_format.pdf
    • https://cdn.sqhk.co/fumamimed/bPibjdQ/93287548915.pdf
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/kokudizulukox.pdf
    • https://vilotirupoj.weebly.com/uploads/1/3/5/3/135328316/zalenezojivat.pdf
    • https://cdn.sqhk.co/wubumeze/fgcsici/head_soccer_2019_mod_apk_unlimited_money_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xibupafuvobiluk.rf.gd/bawara_mann_dekhne_chala_audio_song.pdf
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_e232948937fd47efacd98fead6709234.pdf?index=true
    • http://fizefitelibulob.epizy.com/resumo_da_bncc_educao_infantil.pdf
    • http://jikibepedoroto.epizy.com/risk_assessment_method_statement_template_uk.pdf
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_8953990ac96146b084012fb447781979.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_d14b14cc7d164d6999740cf6cc64f2ef.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124ca.bin
54ab34f7f160387a5080446658751372fee3bc4f9c0ef902918638ce78ae5ce1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124CA 21128 bytes
font_00_sfnt_off0000ebab.bin
54ca23fe0a3518075345d7744ad51b9f0d8496891b1ff2af6da8317ddd5626ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 5680 bytes
font_01_sfnt_off0000fee7.bin
8008e1069d27c046a0d3bcf6f0e77be7137a4db0b7b02654f5eb8235bbaf99cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 12300 bytes