Malicious PDF — malware analysis report

Static analysis result for SHA-256 493968d83bdcd057…

MALICIOUS

PDF

82.1 KB Created: 2021-04-07 23:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b4bc0648dcd4c1324e3e54daa6e709d8 SHA-1: 05f98eb9028ccf6170f67a20efa571f7d175d5be SHA-256: 493968d83bdcd05759f755ddb7709a3804b68ddcabd7ed52282a28b9f4032783
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, though partially garbled, references 'Fitbit versa lite apps list', which is likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=fitbit+versa+lite+apps+list PDF link annotation
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/45e8caed20a083.pdfIn PDF document text
    • http://dolinunuridaku.iblogger.org/xosurofemelutegula.pdfIn PDF document text
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/4097365.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/11601742.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/4449713.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/gekuvulewisi-sepub.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/xuzefuvi.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/buzomurowip-rafigubosu.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/9250835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/the_wedding_pact_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd71de43-ee43-485c-ae24-01b3e97ddd27/skyrim_strategy_guide_special_edition.pdfIn PDF document text
    • http://xolelapideruse.epizy.com/artificial_neural_network_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a222045-1af0-4ca4-b7a9-c5ab9bc77dea/72_king_kutter_finish_mower_belt.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/22253344390.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_a5d11b70988441638001d2892d0251ea.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_e96e654636ea4d51981cb445e4ec9d50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/rukob.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/du_admission_form_2019_release_date.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_8d5be142b3f44f9383477b087f412918.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_63a2625c87a54d72ac5fb873a3ad7c82.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 4968 bytes
SHA-256: 26dc50960db854890b7fd40b5bae4cd4c24a0626cd56940aebcb3fbc246ba966
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10900 bytes
SHA-256: 4734594ad52d07dde38a07c477b5075a5e18a19d3f9b6c2dc73934575553ead4
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 16208 bytes
SHA-256: 7960312706b4b6b80d6c1a02ea1d86f4abfcd1c95e1c992a0b0d227df3d9580a

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