Malicious PDF — malware analysis report

Static analysis result for SHA-256 875798a8de6b02d1…

MALICIOUS

PDF

110.2 KB Created: 2021-03-05 13:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 01d490487ccd3ae2856881ab1c326d1b SHA-1: ba8d1b7a32fc341ec660f9c7b34bea6188d0a740 SHA-256: 875798a8de6b02d12b75718943c0838a8e85d2c19f7bfcbb0d10c9fdfc21ac15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=hatha+yoga+meaning+with+examples PDF link annotation
    • https://cdn.sqhk.co/fiporalisu/jaijph0/idle_transformation_mod_apk.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/tuck_everlasting_read_online.pdfIn PDF document text
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/3012c21f29c1.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/what_sd_card_best_for_gopro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fed4a7c3f2f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ADjbhcw/gajiranorokuvexi.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/igihLgc/within_temptation_entertain_you_album.pdfIn PDF document text
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/4048400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5fca188108507.pdfIn PDF document text
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/voluv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcdf84dc482f.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/does_china_have_a_constitutional_court.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_603978f986842.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/rhejel1/nuviloka.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/5b4093897c2.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/hdijIjb/speed_motorbikes_exeter.pdfIn PDF document text
    • http://libotopatolar.iblogger.org/tatawowipibikivaxazila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://laxolivavaru.epizy.com/graco_pack_n_play_mattress_pad_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/sentry_safe_lost_owners_manual.pdfIn PDF document text
    • http://kogosez.epizy.com/manual_usuario_samsung_galaxy_buds.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/9732859937.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/6005056709.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/costco_acai_bowl_nutrition_information.pdfIn PDF document text
    • http://fuxodenajakifut.epizy.com/kenmore_ultra_wash_quiet_guard_deluxe_filter.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_off000160d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D2 5360 bytes
SHA-256: ffdbfd236c380b0aadbe9a7fc17d68eb72ca894d0930a4bdc8610ef9f33adc00
font_01_sfnt_off00017308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17308 14652 bytes
SHA-256: dffef821f9c6c956200682d8409d5b8e58adfac4dc9beb1c7a1cfc29b5e47c68
font_02_sfnt_off00019c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C9B 3272 bytes
SHA-256: e54ca72832fb04d907e30054f843d8abc594f11fc16b932afd9067292506f520