Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc8691dea994cd1…

MALICIOUS

PDF

77.5 KB Created: 2021-02-23 03:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0396a58361896867d2d0ee8616649e54 SHA-1: eb084705598bee140c6a13baa2445ee384791d58 SHA-256: 6cc8691dea994cd1bcfc76d295db025d68e7e9c728ee39d2705ee39b452d6566
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the structure of the PDF point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jottigo.ru/wix?keyword=east+hoke+middle+school+raeford+nc PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/IMRdbhb/17686902173.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/geM3Zii/zest_smart_appliance.pdfIn PDF document text
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/tenerujuk_wawev_potubap_bubowasi.pdfIn PDF document text
    • http://geekcods.com/bride_and_groom_poses0dk14.pdfIn PDF document text
    • http://rafale.store/jugexilikilinaweterekvkoyt.pdfIn PDF document text
    • http://filanion.online/dizumorumadlnxt.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/cIiehcP/best_tags_for_likes_app.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/1nhe6ib/starhopper_test_today.pdfIn PDF document text
    • http://lalashoppen.online/685872065105rqg5.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/1171725.pdfIn PDF document text
    • http://specialsale.info/punibiviwasoviwomuvimofim05vzq.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/jcHJmlu/pijadurelaxoposevoro.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/QjjrgjP/jupabixitona.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/hcjdidZ/bubble_letters_lowercase_l.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/mujivenobufu-sebomobibewan-fimulim.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF27 23496 bytes
SHA-256: 3a9fa00c89ecc8de98bed4a0814329a6175d28cfd907029dc922a9cfcb4c0b2b
font_00_sfnt_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 5284 bytes
SHA-256: af4f4172dcde3d7c5ea50898fc0061a5043017b4f60ff2c7bbdb357cdb90f64e
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10852 bytes
SHA-256: 157763b29de17d93017f039d49a7a8262dd09fedcfb3c387bb2c1b503cb9260f

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