Malicious PDF — malware analysis report

Static analysis result for SHA-256 766d5b18ab26bb22…

MALICIOUS

PDF

76.9 KB Created: 2020-11-05 19:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5faf9699d4b4b3d82a515a2022dfeb9b SHA-1: b5307c4225898eeb67f85c4689d0161586c16758 SHA-256: 766d5b18ab26bb22c24a1e182dede24b09f737714dc77115e3ebd40159e28a38
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to disposable hosting services and a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm designed to redirect users to potentially harmful sites. The document body itself contains obfuscated text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://traffking.ru/aws?keyword=l.c.+bird+high+school+website In PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/0b8116f6c5d9e9.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/mepokanarewurubafox.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/gavudom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fa31617944ae.pdfIn PDF document text
    • https://pufotawimudob.weebly.com/uploads/1/3/4/3/134380049/bepixefaner.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5de8960330ffce.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/list_of_adjectives_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/all_of_skam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3357/4555/files/words_with_ict.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/77656756535.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d299.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD299 16996 bytes
SHA-256: 48e187cb26a077dac935069b11be0a444bb691fe1feea0fe83468050c8be2824
font_00_sfnt_off0000c0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E6 5196 bytes
SHA-256: 9af595b42c7093d804e24fc622d66a55d83dab255fa848086d6b26b8eb6c6818
font_02_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 10852 bytes
SHA-256: aeb5e7ed48aa57727040dcd87efc56a6f3b53d35a7fdfba6e2b8f1ba57129d3f

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