Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c60108f25b8b668…

MALICIOUS

PDF

78.2 KB Created: 2021-02-21 11:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d402abacb22f9827c8419a490223bd4 SHA-1: ee561f3ce25942f910b4e03332d19e77c35d6cc5 SHA-256: 8c60108f25b8b668beeac0e7070e1fff20020d5dcc247ec92cb97a9e47656b33
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://yafferge.ru/123?utm_term=danby+air+conditioner+12+000+btu+costco+reviews In PDF document text
    • https://static.s123-cdn-static.com/uploads/4489428/normal_5ff63a416c1f5.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/hiiicX2/country_war_battleground_survival_shooting_games_mod_apk.pdfIn PDF document text
    • http://trenolgia.buzz/printable_guitar_neck_templatewxwhe.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/pptRhbC/gufeletawufofewuzulabob.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/hxjinpZ/rock_out_with_your_crock_out_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/sicDhaF/american_women_s_basketball_tournament_2020.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/kukij-gaviravafo-fuduluwamaxag.pdfIn PDF document text
    • http://avit0.pro/denon_avr-2113_netzwerk_hdmi_av_receiverouddw.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/jgjeih6/93026037382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393029/normal_5ff0e8c143cab.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/ggeugip/97166382308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_5fd162244ad1a.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hf8fLPh/download_beach_buggy_racing_2_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ijgwokY/fun_words_that_start_with_the_letter_e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 5500 bytes
SHA-256: 7005a82e7ecf8a2cac445384a944546eca7162bbe0efc2804233b8d9ec7b3c77
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 11000 bytes
SHA-256: 5cf39ae5a8a56d4d9eec47277fdc86c04c07693c3fb3bf2f3b3022636d1d62d1
font_02_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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