Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0095108898ad3b…

MALICIOUS

PDF

75.3 KB Created: 2020-12-23 20:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f16fb42ef0c2b611adc5da2ca6436a14 SHA-1: 7cb9d7a8204569f826105517954cf3f25029fd56 SHA-256: aa0095108898ad3b98d94097cc14a0da721205a96f1d699b5bdad586b49ab8b9
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=bit+legends+monster+guide In PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/jonelafovivepugaxadu.pdfIn PDF document text
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/kabafusezorewizozef.pdfIn PDF document text
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/2809562.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/zalagekized_dinuxiloseluwe_wilaxi_rusuxitita.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/f3863fc95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f972df22acab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f931b2ab4633.pdfIn PDF document text
    • https://tiwidugeges.weebly.com/uploads/1/3/4/6/134635585/1109f71a8.pdfIn PDF document text
    • https://tejivabir.weebly.com/uploads/1/3/4/7/134714352/juwuwugikul_numodiwob.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/vulif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f9631aa01da2.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/f6b31e49-622d-4909-8f43-f771b9052fd8/bloons_td_5_free_download_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742e9937-d3a8-4f59-9eab-f77329f214ad/muxiwuluribubowuwunil.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/85514003470.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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 4984 bytes
SHA-256: 7fec3b7aa83da50a1eb5870ed4cb5a912c434eeadb6c7ece44e1891515cdec3c
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10732 bytes
SHA-256: cc1fec336630419fd8c364c3a95c1f49c143fc25264f37c738ff21ba295416f7

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