Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55ea1226813cca2…

MALICIOUS

PDF

70.5 KB Created: 2020-12-31 16:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f6d904727d9fd74a66013d6884adf82 SHA-1: b8c1f8c92b09f3584f3dab5371a412228284eda8 SHA-256: b55ea1226813cca253ab57abae345ed7cd3fe794cced5be8db34808fb7ccfa51
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=venus+flytrap+for+sale+nz
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/2155679.pdf
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/7553062.pdf
    • https://savumolakom.weebly.com/uploads/1/3/4/6/134617738/7dd2491.pdf
    • https://cdn.sqhk.co/fixakozumad/hfJjaia/green_pepper_soup_with_hamburger.pdf
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/mujuvamenar.pdf
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5fe3d5e22523a.pdf
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdf
    • https://cdn.sqhk.co/rajexizeba/gg89hbt/13195767674.pdf
    • https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/0468a58d6be.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/vagizusalabamawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/af796b3d-90fd-4e77-b23d-606463e5200e/better_words_for_very_happy.pdf
    • https://uploads.strikinglycdn.com/files/14c19c32-1892-4d94-9c40-5ac8a721db63/gasuxafonifimer.pdf
    • https://uploads.strikinglycdn.com/files/8875ba7b-bcfe-4dab-a965-279904fbda08/xifoxiloxubabofotamoj.pdf
    • https://uploads.strikinglycdn.com/files/7d29f5cd-832b-4f79-8617-268ea2b45ee3/blue_guide_new_york_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb64.bin
57b348d1e80b58979a3e237a47bf36308221e193d3b8bbfdc0ed22960e89d6e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 4848 bytes
font_01_sfnt_off0000dbfa.bin
fd7ef1b87d8667dd893b211400ecc29e673235a0adef9bf76abde302cf6eb8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10368 bytes
font_02_sfnt_off0000ff38.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 4324 bytes

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