Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e629dc131b83d29…

MALICIOUS

PDF

78.1 KB Created: 2021-03-25 18:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1acbee8867ab2e8612227f41c9e0abec SHA-1: d1f3ca2e0bff7e3230acec83cbd06b3335dac1af SHA-256: 3e629dc131b83d2974d005ac20baa12969eba30fcb461b4f7bce8a6880815444
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=php+for+the+world+wide+web+foundation In PDF document text
    • https://xojinumawot.weebly.com/uploads/1/3/4/3/134377449/gewatu-lekik.pdfIn PDF document text
    • http://ejqy.com/cunningham_s_encyclopedia_of_magical_herbsm9loc.pdfIn PDF document text
    • http://lobafor.mypressonline.com/37600360367.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/838765.pdfIn PDF document text
    • http://formulamoney.top/amsterdam_coffeeshop_mapcmilx.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/66idxb9/9941634559.pdfIn PDF document text
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/1413625.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/5445672.pdfIn PDF document text
    • http://alifan.store/66439046875fmk2e.pdfIn PDF document text
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/9752770.pdfIn PDF document text
    • https://dilewujolar.weebly.com/uploads/1/3/5/3/135308995/zedefikusogama.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/1NhiXhe/viruses_vs_bacteria.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/73Tjbge/baby_bunny_running_in_circles.pdfIn PDF document text
    • https://bisimopax.weebly.com/uploads/1/3/0/8/130814127/rigubizirelodozeleda.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/586bc886fb70a4.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/1431025.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://uploads.strikinglycdn.com/files/38398599-0674-424e-b023-e55700889601/48971482909.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/beduwekadadew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82482f4-cd1a-48af-8eb1-14ceb7ea399e/intex_sand_filter_valve_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26346de6-a36b-486a-a7ec-3eb86793b05c/2020_honda_rebel_300_gas_mileage.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/animal_cell_culture_methods.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5068 bytes
SHA-256: 26c927d92b6bcd2976b3d57438d9937b21c624036d9090681f3909838141163c
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 11536 bytes
SHA-256: b49ed8538a96b6019741fb70bb207ecbb87b401fa7386e5dfa099214b1d8f29b
font_02_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f