Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a36abe4ce267b77…

MALICIOUS

PDF

78.4 KB Created: 2021-03-16 15:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1975d04309682cbf277eb8ddc48ace4a SHA-1: 55f734e53d13630f8cbc4f6490c31d18e9185248 SHA-256: 9a36abe4ce267b778ada84b9943034f46eb1ff33a0381e4be041f94d8ce6df3f
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 are disguised as academic resources, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=past+tense+vs+present+perfect+tense+pdf PDF link annotation
    • http://totalcreditcheck.info/asus_pce-ac68_manual57dzg.pdfIn PDF document text
    • https://xetetikagidol.weebly.com/uploads/1/3/5/3/135308020/fetugukodit-gukimiwedimokax-femeruwor.pdfIn PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/7840251.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/sexinefolakulo.pdfIn PDF document text
    • http://meetplafond.xyz/rains_of_castamere_piano_sheet_music_free6a4pw.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/pafadupugim.pdfIn PDF document text
    • http://rupuvuk.22web.org/does_verizon_have_any_specials_right_now.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/88c3a049c.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/dazifozixawus/what_is_western_philosophy_all_about.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/assassins_creed_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/sigejafiwe.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_7738a238d2a24d7a960e65f01f12a612.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/dexusogafotusimekade.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_93ef0addb8af4ff0acbaa662a1bb630f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/quadrafire_pellet_stove_parts.pdfIn PDF document text
    • http://sogonuvusawi.epizy.com/tuwijawo.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_009c7c2aea294a18b665fcf2998da8a0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46f.bin
3c443cadc5eccf1f3a6244e90367c207424133bc0d89ee4808a93cc51d5ff1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 5180 bytes
font_01_sfnt_off00010626.bin
116240d7476190a4286135bc845def28355b52809113deeb8cac193967464d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 11260 bytes

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