Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463b12ed5094c70…

MALICIOUS

PDF

72.4 KB Created: 2021-02-06 01:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6eb70b838194880360de1aceaa4e3b14 SHA-1: 6f0a85eb0432948f626124a83e8a4262837393ea SHA-256: c463b12ed5094c705cec2879a2dd162cc2672d0d446b56aac8daabb7b8c6f2f0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though heavily obfuscated, contains references to 'app download' and 'camera app', aligning with the observed malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/123?utm_term=samsung+smart+camera+app+download In PDF document text
    • https://cdn.sqhk.co/wubofuse/dChijcv/allianz_myhealth_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fffa2de61357.pdfIn PDF document text
    • https://cdn.sqhk.co/gogadibavuta/B8rjbzL/23351012615.pdfIn PDF document text
    • http://trenolgia.buzz/35047509576f650w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_600f46d28adf3.pdfIn PDF document text
    • http://jirafka.space/antenna_light_font_freefgrf4.pdfIn PDF document text
    • http://siankaanmexico.com/29369337138jw9jt.pdfIn PDF document text
    • http://mx50off.pro/vapewewefiwisivinegavaampkq.pdfIn PDF document text
    • http://samo-katim.ru/card_jitsu_club_penguin_rewrittenz2uf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5ff92724b9141.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/kpujfuV/steam_inventory_value_calculator_dota_2.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/sidazofe.pdfIn PDF document text
    • http://xsale.trade/2pac_dear_mama_lyrics_meaningrhb6n.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_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 5588 bytes
SHA-256: ebc4cef815ac09137e34dcf6b40f34cfe7bc6d4769072a56ef8f6a7fa793cbe1
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10680 bytes
SHA-256: 60aa415133d34929ec3b494db601cef7f68c6c1c50478ae53b6a577d5fd9bc7f

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