Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c7798b7f20d5a4…

MALICIOUS

PDF

75.8 KB Created: 2020-12-28 06:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 517e38b4cc08db52140f151952b44088 SHA-1: 7c119a1ee86267a950fb24f89578f0010de44ee4 SHA-256: c3c7798b7f20d5a4d685bcab706dba336a634eabdf4a25ccc3feb307d6af9677
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large PDF link farm. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be directing users to external, potentially harmful websites, as evidenced by the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ggtraff.ru/aws?utm_term=brightness+control+dimmer+apk In PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/jipubiwusovodiroro.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/kuxomamexotosi.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/bojuw_sotebibaw_nozezepuxafawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fb7a4aba67b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497344/normal_5fcaa8edb025d.pdfIn PDF document text
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/wedutabudimev_rufalorepuvipim_borawe_latalenulada.pdfIn PDF document text
    • https://vudolexululuj.weebly.com/uploads/1/3/1/0/131070894/4239473.pdfIn PDF document text
    • http://bytlly.com/1bffi7TheyIn 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/1801f7ad-5faa-4586-8125-f272adaed643/jetobegavisexaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4681174-13a9-480c-9eab-ac3cf01e2bbd/50182071464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4097a94e-3afe-4229-a1f5-b52b2d59e551/abaqus_manual_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/88220773935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57189f9c-7965-4af4-afc2-353148245fdc/treasure_of_the_four_crowns_download.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 5388 bytes
SHA-256: 37273aae7b6d1b3e815743874e7cbd15b86ed086db8e96d58844648702844c97
font_01_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 12432 bytes
SHA-256: 134ab5caa3691d6881a149e6bfc4181cde51d233800a455e7532dd8937d58ded
font_02_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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