Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a78b48e8c119a5c…

MALICIOUS

PDF

66.5 KB Created: 2020-10-05 17:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de53d26d73b93516adb505c9ae314909 SHA-1: 6065d6e08a00e1a4bd36c5da44cb081e39c883b9 SHA-256: 1a78b48e8c119a5ce5fb4fc6d5fc86a5378dda88d7e579ddf25c0e43c854909c
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to manipulate search engine results or distribute malicious content. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to phishing or malware download sites. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=cartilla+de+importacion+dian+2018+pdf In PDF document text
    • http://zokobuw.inspirednourishment.ca/uploads/1/3/0/9/130969483/8888226.pdfIn PDF document text
    • http://savurike.glastonburyforestschool.com/uploads/1/3/1/6/131637352/8224485.pdfIn PDF document text
    • http://files.writing-raven.com/uploads/1/3/1/4/131438038/pujakata_gagifere.pdfIn PDF document text
    • http://jixosak.kansascitywriters.com/uploads/1/3/0/7/130738706/8241048.pdfIn PDF document text
    • http://sotinava.hanktakenalive.com/uploads/1/3/1/0/131070382/a4e421d848f3ef0.pdfIn PDF document text
    • http://files.jefferyspicer.com/uploads/1/3/1/3/131379923/2219011.pdfIn PDF document text
    • http://pawag.friendoffaith.org/uploads/1/3/1/8/131871674/povapipabalerat_zujikosipulitu_gukefosuziwemud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3274/3583/files/zivavuzedigetumejuwamas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6374/5953/files/yogi_bear_song_rugby.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4783/6058/files/65965570265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84480615-b7fb-4b96-a963-64eede17b1c9/nujefemibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d4b1f3-dff8-49e5-82f7-816571683c86/25147196213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ea0ed3-475c-4cce-91fe-ddb31c4d134e/kudenenitukuriz.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_off0000c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 5548 bytes
SHA-256: 12b143f09a03f12a0a7b263919650a3e29369e03a8db2ea577cb91ae7a2a0feb
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 11656 bytes
SHA-256: e019a32ac60b3ecb6fcbaa72442b02de2237cfef3990aa7bcda0912be6319e05

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