Malicious PDF — malware analysis report

Static analysis result for SHA-256 508cd5ff40be829f…

MALICIOUS

PDF

84.2 KB Created: 2021-03-20 05:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a8c7eeab3b221e855fdc96bf7072f27 SHA-1: c8e4f287c95dbdcefa4020b8a6094a94d09ebfae SHA-256: 508cd5ff40be829f8b58adfbc6e16cd2be9f46a4f5d448044504951749da1bc8
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of an SEO link farm, with a specific lure for 'watch anime apk'. This lure redirects to a malicious domain, which in turn hosts further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://resalured.ru/123?utm_term=watch+anime+apk PDF link annotation
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/lojewapud.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/xofomijuk.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/vepawuserofolad.pdfIn PDF document text
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/d7c786d7b0fbe.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/xevelan.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/baposofatuket.pdfIn PDF document text
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/nabamiranoduli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/72592489247.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/tolipaxefufo.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_fe328cda9fe0467aa300d531819391a1.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_23b614fd90ab4a6db4be67236f468307.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/2004_fleetwood_laramie_pop_up_camper.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_4387c4ca2c604b56b268f539a2d8031c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goviwigax/android_apps_on_iphone_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/podumifonot.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/jenuvududitatugepagigeli.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/81058245406.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/vefigufemowoxaxejediburip.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/whatsapp_scan_app_pc.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_b36957069d02415eb0aaac4ff5ad2290.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/actuador_neumatico_genebre.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/wallpaper_4k_for_mac.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 4944 bytes
SHA-256: 47929e7dd10ab6bfca335749efcfca49faffac29d8a8b0de8eef0f05a8c6dd40
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 11256 bytes
SHA-256: ebb8aa1699cf18e83ac6467fcac0ad41821943fed48daa2de5ad5e25fe5ee82f
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 10684 bytes
SHA-256: 93a5d73dfd4e2c2dc613462b3af54bcf95e016d05507515557d48e99b979379e