Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f8a181fbff2bcd…

MALICIOUS

PDF

78.5 KB Created: 2020-12-28 06:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6c7dd497e8e48e562696fc79c89eef6a SHA-1: fd091adc84624c58a85e82083f388b2546fc6516 SHA-256: 92f8a181fbff2bcd2c95f0221566e9bd9f375f53a7562d27abb585d05779acc3
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed as a link farm, likely to distribute malicious content or phish users. Although no scripts were extracted, the presence of numerous external links and the ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=emergency+alarm+bracelet+for+elderly In PDF document text
    • https://cdn.sqhk.co/pimidima/v1gPjgg/rope_binding_guitar.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/e0bc43.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/604bd7d5310b2.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/nesibuganut.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/wePgeig/49463169122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6394a91e-b809-49eb-9dbf-566dc33dacb8/11287721497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36109682-0282-459f-891e-751dff2ea514/lodakosonefowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67c2c85-e0af-45e2-bbc1-dffb07e6ad4a/41923544763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2688b2-0559-4780-8834-daab6c731ccb/33090981555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaf93bb-0d15-4dd3-b543-46a8a0706c89/dr_franken_game_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/balu_mahi_movie_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0389fd26-8f6f-4199-be12-7773ac2455d0/feboxelilinala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d97665a-b469-41e7-a5bc-89dc9980c3f1/kifodiviluk.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_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 5364 bytes
SHA-256: a301eac766b532653effe07b81da346fe1489d5be360905f6b8e104ca221bba5
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10584 bytes
SHA-256: b3b079141f3eb3a8475b3c748f59e0e59f01ec91ff2b756f471c0ecf286221e8

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