Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173303215570758…

MALICIOUS

PDF

74.6 KB Created: 2021-01-03 03:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6b6de8a622c85f6f41003ab0b9ad4dcc SHA-1: 2e11c235c8d05dd7edab9f010d2fc791cf1fe82c SHA-256: 017330321557075856b24d92a5e6c7c4c70c9dcc9f0440fc869860b35fad58c2
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious content or scams. No scripts were extracted, but the presence of numerous external links points to a potential initial access vector 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
  • 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.
  • 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.
  • 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/aws?utm_term=university+of+birmingham+campus+map+pdf In PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/bivukuzogovisu_gakilefevom_pobijixo.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/bUijbib/car_crash_in_massachusetts_yesterday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fe902c3037e0.pdfIn PDF document text
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/pedetizo-zupebobozutatum-tavevutatigili-xivakavezibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5f9c829f7f734.pdfIn PDF document text
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/1171845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fca3debd0a56.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/vevugipalibiripufo.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/aicnIhi/rabovesaxewizepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5fe650bc2b4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5fbd37ba45f77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462982/normal_5fc6fb044dbf9.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/zikes-totiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f8aafc024c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f9633cfa3eae.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/741d1929-8d52-481a-bd5f-6ca6c62f4448/39167506325.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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 5828 bytes
SHA-256: 35e590baa758521d6f3c7a22467820707927a1ab71e6d1682968bd804293e600
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 11036 bytes
SHA-256: c7c5c8c381002672c14e9996f6f1a8414f351d54696dab03c087c1f32cd6fa5c