Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bffa673f8230095…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 13:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4910e3b9a74e3fde709e23d117828660 SHA-1: b0df258a04ae60fe570d187d6b4bc2bb7395ac0c SHA-256: 2bffa673f82300955a3d7ae0f51f82809de492f23fdedfff3ff0910df543042e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded links, such as 'https://yafferge.ru/wb?keyword=ray%20bradbury%20books%20amazon', are indicative of a tactic to lure victims to potentially compromised or malicious web pages.

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
  • 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.
  • 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.
  • 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/wb?keyword=ray%20bradbury%20books%20amazon In PDF document text
    • https://remafubununabex.weebly.com/uploads/1/3/1/4/131437283/vilonenigizipof.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/takumivazofumor.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/jixemupukulab.pdfIn PDF document text
    • http://7evenrp.ru/341796912458abri.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/7825424.pdfIn PDF document text
    • http://avit0.cc/us_army_special_forces_patchi8t2v.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/22fce8ab8c359cf.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/xarekebepim_dizeboporili_rufivefarogoja_jaboxuzajazik.pdfIn PDF document text
    • http://betmoy56.com/vokewusawudeteo5.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/49564.pdfIn PDF document text
    • http://artdebug.site/utorrent_pro_uptodownn2ppp.pdfIn PDF document text
    • http://megantv.site/6120754903409wvj.pdfIn PDF document text
    • http://procripton.com/gadinasozowupalupgejtn.pdfIn PDF document text
    • http://4gusevshop.website/pixel_gunner_apkjr012.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/194306.pdfIn PDF document text
    • http://frankiearvelo.com/comprehension_worksheets_for_grade_6_englishdk43c.pdfIn PDF document text
    • http://astrohelp.space/insight_ias_daily_editorial_answer_writing2vaxz.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/2206167.pdfIn PDF document text
    • http://osmosiotzs.fun/chelsea_fc_vs_watford_video9aj4w.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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 5300 bytes
SHA-256: 194e4344947c1b74e99129d68b190bed45734547e8bd6c4a83d13c75e068b2c6
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10284 bytes
SHA-256: 6a8d81fe2957596fa0be3c29f09e339a377ae6651f463e8d90032f5e47ccf26a

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