Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e47c39738113c1…

MALICIOUS

PDF

73.4 KB Created: 2021-06-01 02:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f2aa940f98228f3ad546bc5424aa8cb8 SHA-1: 536f3c2cdef83cb52944fa6611524393212f54e7 SHA-256: 52e47c39738113c131c797b2218d9711848342da1ddd4a870fa4602b132eff80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which are to SEO-optimized PDF documents, indicating a link farm or phishing attempt. The primary URL, 'https://huntic.ru/pbw?utm_term=can+taking+metformin+make+you+tired', suggests a lure related to medication. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://huntic.ru/pbw?utm_term=can+taking+metformin+make+you+tired PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456660/normal_5ffbf2dd7fba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fdc4ea477551.pdfIn PDF document text
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/buliji_xovara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_603ab2544d1c7.pdfIn PDF document text
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/2246644.pdfIn PDF document text
    • https://lejezobuvisejo.weebly.com/uploads/1/3/4/7/134763899/regabizijo.pdfIn PDF document text
    • https://tifunubuxeji.weebly.com/uploads/1/3/4/5/134523212/vukuvozuzuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_604f6857b8ad7.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/27d9df87-3051-4d8a-87ff-36b5f1188c0c/como_escribir_una_carta_de_verificacion_de_empleo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aaa98f5-a80e-4d73-9ea1-952a0e70a14e/89628049767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565e3986-7714-4316-ad73-48b63b3357c1/lutufedilugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60706ae-ade7-4d4e-8dd2-49595cf6fb97/29179495940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c595b8-aa8a-43d6-bbbd-e23ecf739286/how_to_use_an_oster_roaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1207c542-b9c1-45ea-92f7-9e4b015e993b/how_to_treat_mild_hypoxia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e4611d-22b2-4ff9-b9fc-2443b5245ad3/widofuvisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2723a2b2-654d-4f24-80d7-be3af25cfc7d/moxoseredexelubiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b07338-9a6c-4b5a-ae42-46d49bb4ef63/25084911719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a12c199-0c50-478d-9d8b-ec719dfbe67e/diary_of_a_wimpy_kid_double_down_quizlet.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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5088 bytes
SHA-256: d584a7eec618590cb5ec6624f45c1040b987d2f848259e73a00b0b744d349e84
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10476 bytes
SHA-256: 6ed5d6ea1e118680c876b3a1c23f004460655fe26946a5a7ac7be86dc413b0ab

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