Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac18857f35941a7c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 14:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 21fe274af8fc0919a7491bb15dd77e5e SHA-1: 32f4328d03683a210ecf354caaa867ec4a1ad580 SHA-256: ac18857f35941a7cbbb50f72f79eba3cc82fefafd041b529eec3ce03682f8042
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link to dafemum.ru and a large number of embedded links indicative of a link farm. The ML classifier and ClamAV also strongly indicate maliciousness. The embedded links likely serve to direct users to phishing sites or to distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://dafemum.ru/wix?keyword=verbs+that+start+with+g+in+spanish In PDF document text
    • http://newser.site/small_story_in_english_for_class_9whzio.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/gelewodi-boxixon-zijimivudarulo-vekilano.pdfIn PDF document text
    • https://waxujonugo.weebly.com/uploads/1/3/1/8/131871493/fifuko.pdfIn PDF document text
    • http://crispyset.online/5_stages_of_grief_cyclex5yne.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/kinabiraxuk.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/raposev.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/the_game_changers_dietitian_reviewtxubb.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/038a2a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_cf57a92717884253994ef1327c3ad464.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujinit/22379970049.pdfIn PDF document text
    • http://lobakixadob.epizy.com/76232717207.pdfIn PDF document text
    • http://piserujirabubam.epizy.com/niwoxusigemuv.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_996712d56f1542d9ac4238f2e7e7e685.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_547c9c1d77984be1943303bc328782c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/hark_the_herald_angels_descant_sheet_music.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_869512c42b4e48b2814cd9b7ac98bef9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/fugifimoj.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/wapoxukixilajurafa.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_882c14b1322b4e1a80c8af11b534377f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijari/nexivedatawovikofa.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/61664854030.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5248 bytes
SHA-256: 36410e9055f813f96ca5661f9a3ff31cf497e415652d28ff5588306c8a3998ac
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 11000 bytes
SHA-256: 805b82fa14a602d78d1a0826f9f970614752cc9f1a283cbc24d0a4af69afaaf2

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