Malicious PDF — malware analysis report

Static analysis result for SHA-256 109bbba83bf89d7b…

MALICIOUS

PDF

46.8 KB Created: 2020-11-05 19:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cab5c6aab75388e29bf04b603a670a90 SHA-1: 84f51615f06d354c5fdc392bec97fcb3d40d5d58 SHA-256: 109bbba83bf89d7bb0f6a4e83aed0c688ce6ec847c900e9f5de520132c06450b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be SEO manipulation or distributing secondary payloads through the numerous linked PDFs hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafftec.ru/aws?keyword=ymcmb+best+songs PDF link annotation
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/5931802.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/672f0f26.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/kisoneje.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/povakokuxefos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5f98c0667481a.pdfIn PDF document text
    • https://mepopuwiv.weebly.com/uploads/1/3/4/4/134499337/ziwimofatubuvime.pdfIn PDF document text
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/vosimo.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/669b28.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/balevedamurerozis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9a605649-3e20-4811-b1af-9b438f6cf094/benedetti_la_tregua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2f23e4-ab8d-402c-a9a0-995739ee023b/48313155738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb6ca9a-cc51-4b26-9566-c6b01140d118/lupapozazirudogomufowujim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0A 4624 bytes
SHA-256: 1d18f1141bfd146918edf6149264fd880f39f44e8a0003fcf5b243318dba66a8
font_01_sfnt_off00007ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA5 10904 bytes
SHA-256: 52b0a0ee072cf392dd51ea6c2401204999ad0442c489fa5f1ca36ea721bf5307
font_02_sfnt_off0000a084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA084 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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