Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bcdda33e95bc08…

MALICIOUS

PDF

73.7 KB Created: 2021-04-26 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6aa02c73792fc4aee4cded1063a12679 SHA-1: ae345b8515b05848a710ee54a8e67726b6feefb0 SHA-256: 55bcdda33e95bc084a99f975d143a6cbdf9a8e06bc601afeee64fe18f69b80ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

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
  • 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.
  • 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://resalured.ru/strik?utm_term=medicaid+transportation+services+michigan PDF link annotation
    • http://lolkek.xyz/cyber_security_incident_response_playbookt0js7.pdfIn PDF document text
    • http://bufo.online/tracktion_t7_64_bit_download_updates1u0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5fe0b742d2b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6044f5e88f56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_60412e4f3a685.pdfIn PDF document text
    • http://bestcreditcheck.info/wolf_of_wall_street_margot_robbie_dinner_scenernt2t.pdfIn PDF document text
    • http://chambrehq.xyz/gevexezotejuripuxot9jqdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_60279c45be5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6032e89d412e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600f149183ad8.pdfIn PDF document text
    • https://xasigebopij.weebly.com/uploads/1/3/0/7/130775268/jafemegudimipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_6029a088be08a.pdfIn PDF document text
    • http://keto-menu.online/tipopunudufunekugumovulunkiq4.pdfIn PDF document text
    • https://pobexapuze.weebly.com/uploads/1/3/0/7/130740180/lufibumalilojesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wirobateruku.rf.gd/attahiyat_full_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2278efbe-63bc-4336-ae0f-6b7281cb3b83/belkin_ac750_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f61758-36da-401f-a179-3a856ecf072e/nixon_mini_blaster_user_manual.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/dabexulusoxaboxoloxof.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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 5520 bytes
SHA-256: 517a700bc70e3ef6f3f6675671f0540e4a3a096a741fa4192b8ac3fb9cbf00d3
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10636 bytes
SHA-256: ecbd7191d1284af730915888a0f9ba5871c83a15069bd258ea0f67f68b0a67c4

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