Malicious PDF — malware analysis report

Static analysis result for SHA-256 6861e670e68db120…

MALICIOUS

PDF

75.9 KB Created: 2021-02-13 16:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5af56afcff2856469faf69269722efb5 SHA-1: a1728939be261a117640c4bc546c38127ea15c31 SHA-256: 6861e670e68db1200637d01cae50392f43a7985536e0fc256b1848e87f0f0c23
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a site that appears to be related to downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=final+fantasy+5+android+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455380/normal_601a4bfa5edac.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/ha0sjbu/biwujerobavuforujobe.pdfIn PDF document text
    • http://submonster.xyz/forge_of_empires_guidei9jfl.pdfIn PDF document text
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/8515692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fe6988414064.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hiPvV7b/download_goat_simulator_mmo_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5fe97e6d554dc.pdfIn PDF document text
    • https://pipumemudif.weebly.com/uploads/1/3/4/8/134866913/9252ade.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/5419462.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/xujejigu-metefapalaruda-dafunux-lepuzowule.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
    • https://s3.amazonaws.com/vukujidor/capsa_susun_online_poker_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/days_of_wine_and_roses_lead_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/32954112349.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/action_verbs_word_search_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/audi_a3_2016_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/79905656717.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/bomberman_roms_snes.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/briefing_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/amore_baby_song.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 5104 bytes
SHA-256: 05b20d634db1d6ca3efd6d878a23cd695d5a10c06d4730d3af1c2697820122e7
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10308 bytes
SHA-256: f17644269c874c4d0562032cdab6089105382ad482752958eced00b99c4b2ff9
font_03_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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