Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a11245cecf33ba…

MALICIOUS

PDF

81.0 KB Created: 2021-03-23 19:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d686b8c24b082f7daa3278ae1a95c3f2 SHA-1: 5844e14f437c23b048859bc7a4a1015ab5d28e31 SHA-256: e9a11245cecf33ba5b9ab9c0a774e925859e12082209b4df80865649da10ca81
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://jottigo.ru/award?keyword=mta+subway+map+nyc+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff204e1cff54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_5fe6587edf51e.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/cuisinart_air_fryer_toaster_oven_toa-60_parts.pdfIn PDF document text
    • http://pimolala.22web.org/auto_reply_whatsapp_message_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_604045e8df247.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/tokyo_ghoul_opening_1_roblox_id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_60089044c7c40.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/ibm_icetool_manual.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/how_to_tell_if_someone_is_lying_facial_expressions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5feefe3d4d1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_601e413c7bc20.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/zujupobilojudopufogiziku.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/matijaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kodeketabekem.epizy.com/the_jesus_i_never_knew_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/junie_b_jones_first_grader_series.pdfIn PDF document text
    • http://konogorubur.epizy.com/54937992722.pdfIn PDF document text
    • http://legabukev.epizy.com/gotozimibive.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/coding_decoding_new_pattern_ibps_guide.pdfIn PDF document text
    • http://pigozezidum.rf.gd/21775588652.pdfIn PDF document text
    • http://fixobijuruloluk.rf.gd/kickboxing_fighting_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5120 bytes
SHA-256: eb4eeb02396f22447ea486f2ca89ed700df115ec44cf3e9b40cf6ef4ad1ce6c7
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10948 bytes
SHA-256: f1d56d3f51de115c37ad4e3c34d688fffc9064f599596b37c89c3b82d2da6e0d
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f