Malicious PDF — malware analysis report

Static analysis result for SHA-256 852f33bf4ec264f3…

MALICIOUS

PDF

70.7 KB Created: 2020-12-19 07:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 12a0b843df8f900d2cb71be057aac315 SHA-1: 3f2c77a4cc90dea9c536cb9bff698ef8f12e9d16 SHA-256: 852f33bf4ec264f3c2196569715740186648127d046361592a819949456b2cb2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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
  • 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://gettraff.ru/123?utm_term=evenflo+tribute+lx+target In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fa8909aeec4b.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/1193172.pdfIn 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/d1bc1b72-5464-4339-970e-551dcedb4fca/scott_herman_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/86391059119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6b57d1-6e03-4d34-a664-b8715ab44d80/14123529192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc23f8b-89ae-4bac-a82a-7f984c2e2d2c/fallout_4_silver_shroud_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1047f6ff-f08e-4e72-b582-f4f5409c17a1/zumejonanevalivagebobem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafe954b-3e93-4a43-b031-3606e2493876/xarugowimomolibirive.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/wedge_heels_brown_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/talegidubisavo.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/heart_piece_guide_ocarina_of_time_3d.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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 4864 bytes
SHA-256: 2cb7b50da9a697ce3507b4a59c3e50bb8e9bd758ae7fbe97e165513fbca320c7
font_01_sfnt_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10304 bytes
SHA-256: 27f291d786c937302f35c89ac3dc6d8cdf7b3169e2b78b03c7fd2641c53b97ab
font_02_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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