Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ffc20c133121b9…

MALICIOUS

PDF

74.5 KB Created: 2021-02-22 06:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a3430b462e6b97ddc9cc44fc34804050 SHA-1: c2d0e9fc513130ccbb1b2bbeb568b239770aa651 SHA-256: 36ffc20c133121b9a281ebdf2f25a66dbf759cb56730b9d10f011e1b26076197
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'dental insurance employer login', suggesting a phishing lure. The presence of PDF-specific heuristics for malicious redirectors and a high ML classifier score further support the malicious nature of this file. The embedded URLs likely lead to credential harvesting pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/strik?utm_term=the+standard+dental+insurance+employer+login In PDF document text
    • http://voxamuzovo.22web.org/d_d_4e_paladin_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6009b63026e20.pdfIn PDF document text
    • http://keropuxopujeg.iblogger.org/schwinn_240_recumbent_bike_user_manual.pdfIn PDF document text
    • http://garantiya62.ru/959971488746zet1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ffdcf4f0b885.pdfIn PDF document text
    • http://itali-big.space/58863143412r0ix4.pdfIn PDF document text
    • http://natur-green.fun/washington_state_incident_report_formui53d.pdfIn PDF document text
    • http://idealicacolumbia.site/nozavatijameguxevu6j57i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fdd8d5e9c526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_603123a314d62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogifovemujure.epizy.com/android_auto_video_player_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/15720484927.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/46286307187.pdfIn PDF document text
    • http://fokafupu.rf.gd/new_york_travel_guide_book_2019.pdfIn PDF document text
    • http://biboxafidalus.epizy.com/timex_ironman_gps_firmware_update.pdfIn PDF document text
    • http://pajusokato.epizy.com/drag_chain_conveyor_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/7708176820.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5536 bytes
SHA-256: 4ac97ce60ee3e07499a0163a2484136ac738a51336a43118f77b123605e1b209
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10592 bytes
SHA-256: 24a58580ccd930b2514b79fb79deda0050e3b8a5877d610e5d2c3ec219c1b4e8

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