Malicious PDF — malware analysis report

Static analysis result for SHA-256 718e227b1e87a26f…

MALICIOUS

PDF

75.7 KB Created: 2021-01-12 16:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 482040136996c4c4acad6eda330f6039 SHA-1: b3609d18d0ef81f4bcf10546db95923b5b8c1911 SHA-256: 718e227b1e87a26f1719de73a7119d07006a49343a0113a469a622c1c680affd
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, including a known malicious redirector, suggesting it is part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to contain keywords related to 'Chemistry unit 1 review answers', likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://gettraff.ru/123?utm_term=chemistry+unit+1+review+answers In PDF document text
    • https://cdn.sqhk.co/gegenosuzun/ijVryii/52893307120.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/e1d84cd9c07f.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/jc3Ezh1/colour_bump_3d_poki.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/5761154.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/mifokifawu_tegigilu_jipedo_refekukuneberat.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/it9hfJZ/povunetoladesibuzo.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/4333157.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/aWgdtjh/auto_theft_gangster_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/1hbxjbr/hit_hard_meaning_in_tagalog.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/fisoposag.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/hiQggJD/69336486249.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/yb1idub/85469666676.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/6gw2Fs7/texas_holdem_poker_online_freeroll.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/xilemitipurasas_dilaxurije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5104 bytes
SHA-256: 92b092fc3a7993d0f92c12643d8d89b700846ca65b8431d6e76516ae4e7907f3
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 11948 bytes
SHA-256: 857c6e6b069c8b1d6b5fe34f4230b2aaf642538314b78ba9ac64c71b9bed33b7

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