Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335f8a42e7b4af6…

MALICIOUS

PDF

72.1 KB Created: 2021-01-11 05:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e224759267c50b17a4e274774dc1ecc1 SHA-1: 86ed1992ba60bc08fee1bcd0754e1d751775b64d SHA-256: a335f8a42e7b4af6189cdd7efdf9e3ad9f28bf453fc85dd2fb68a78891ff3c97
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/wb?keyword=canadian%20superbike%202020%20schedule In PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/8470850.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/51462f6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/c5ieGDV/hopeless_survival_crowd_city_sniper_arena.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/if2Mjbk/vovazozizelolonawetosuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475016/normal_5fe2552f2ba66.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jCiifWs/santorini_travel_guide_conde_nast.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/dunubebizerulok_bipitemujoliz_kimuxoxuxag_vokewes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5fc166883b2b9.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/G1hjbha/kinemaster_video_editor_video_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/NmKsphe/trending_hashtags_on_twitter_today_in_nigeria.pdfIn PDF document text
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/2866331.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/bebdc1.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/pokawujemalisole.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 5544 bytes
SHA-256: 15baa37e65881d61f9c616cbbd7c4e21c36152cf1b869c57f0de0ce1e395b866
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10680 bytes
SHA-256: cd13360eac7a52590cc71b7bca7540a3617d331d0f050a3e334cb1b1ec4db40d

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