Malicious PDF — malware analysis report

Static analysis result for SHA-256 5517d8eee2dd9216…

MALICIOUS

PDF

70.5 KB Created: 2020-11-18 20:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 384de0463f130dec258af778a22a0c4e SHA-1: b39ee12424945d20817864c9c2b404c339ec50ba SHA-256: 5517d8eee2dd9216ccf2c2291f0943c7821c3c62445b45eae728a4d6be608d45
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to 'traffnew.ru', indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to deliver a second-stage payload or phish for credentials.

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://traffnew.ru/strik?utm_term=my+dog+sounds+like+he%2527s+coughing+up PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_5fab6d4368ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f9b7d9943f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5fa3f000263d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f8f6adb6da05.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/e96bb67c-9101-4634-9919-9a8d809e83d0/5054615773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd8cc0c-11ab-436f-b339-80e60470c555/manebadofonakimamalenan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d166c9be-12cd-45fd-bc30-ec0cb7933137/wood_shack_soulard_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fb49df-f486-442b-aadf-e4bdbdb1c5a7/momiged.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/calculus_2_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1a0e98-3abc-4e35-85de-350a1ba4e56c/dil_hai_tumhara_full_movie_with_english_subtitles_einthusan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4e46d2-cb24-45f6-ad7d-c16ed1a8fd04/mega_man_bass_rom_snes.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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 5236 bytes
SHA-256: d5f74e552e2645fb0e797a005d67c4c0ee90db171f50fafc5607c603b2bbda4f
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 9648 bytes
SHA-256: 80f4b357b6832cf71c4cffd2a966707d71d1c88c21f4809bae40143283151632

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