Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c997a2b15cd9b…

MALICIOUS

PDF

76.5 KB Created: 2021-02-16 07:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c76c0f8cdc5e9e1b61da7ee7e2224153 SHA-1: a833afa739898b593fce522489cb037e2714bb50 SHA-256: 186c997a2b15cd9bae211b2f225619bb68af73563d66d509943c7b02b31ae846
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://leonvi.ru/strik?utm_term=person+before+the+law+meaning', is likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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/strik?utm_term=person+before+the+law+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495387/normal_60002d9ad5083.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/51557.pdfIn PDF document text
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/8339781.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/rKxUhdH/25280009820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_6003698733192.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/kagedenare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488580/normal_5ff9ad8a623fc.pdfIn PDF document text
    • https://gedamalemomomig.weebly.com/uploads/1/3/4/5/134504316/6f41624.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/aWjj7Bz/channel_five_live_weather.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/uhjxjbm/league_of_war_mercenaries_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5fc82b7096c71.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Zjf0Yhf/98924669737.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/xulepiwa/mapagajebixomizezal.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/baahubali_1_tamil_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/dofifesunipumaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/zowabam.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/lokugafijenuxusifibaluk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/chinese_visa_application_form_for_bangladeshi.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/91860275246.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/finding_area_of_composite_shapes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/functions_domain_and_range_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/zoterazupurusatidutib.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/52755167476.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bidadari_surga_video.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5204 bytes
SHA-256: bc9f370a18989224ee10b057b46b978e4b00b1ff7161f12cc9753857877bc709
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 10724 bytes
SHA-256: 83cf908285920ca723ffae924d54d3efc29b3e3e7cbf5b5fbda2d622f6408363
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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