Malicious PDF — malware analysis report

Static analysis result for SHA-256 571c2d1ca1f1fd63…

MALICIOUS

PDF

69.5 KB Created: 2021-03-01 14:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2184a630c02a12a2941860e9087f4110 SHA-1: b3de6879c468f37fdde28895693009df60cf923f SHA-256: 571c2d1ca1f1fd63b8b1291bcfe81a65d64df97121d0b7db73acf935801edc34
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=what+is+the+phone+number+for+child+support+enforcement In PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/2433678.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/cbPzGMo/alchemy_365_uptown.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/1802892.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/dobugi-mokovogolojega.pdfIn PDF document text
    • http://help-service-support.com/64513726444mbujn.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/wesujavex.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/Bgdgdll/is_greatest_hits_radio_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/5UZWeii/head_ball_soccer_uefa_champions_league.pdfIn PDF document text
    • http://abanca-electronica.com/bukafojifigzie3f.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/1e1d22.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/dwidjjq/yellowstone_tv_show_cast_teeter.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/hiaRzgi/vasuxaxerobivelomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/ph_food_chart_for_gerd.pdfIn PDF document text
    • http://gevuragerok.epizy.com/24208630023.pdfIn 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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 5548 bytes
SHA-256: a667f6f9618adf782f090bb2df2545ea272cf5279f123eea22ec7ae9effcf28a
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 10568 bytes
SHA-256: a084e91bf4a9477fcd198337acac2f4d57526e3742fdd8f02603a4d78428a679

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