Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a41b062aa05a3f…

MALICIOUS

PDF

44.3 KB Created: 2020-11-09 15:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 06ac69b7ad32e103ae30567e2268bbc3 SHA-1: 7d551122ad4299dc218378bd2d33ec4be8ed0e88 SHA-256: c1a41b062aa05a3f58203d53cfcfc2d4b5d2279a03c9b86786f04983753c5b28
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or SEO manipulation tactic. One of the primary links, 'https://trafffi.ru/aws?keyword=municipal+center+west', suggests a potential phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these external resources, which is a common precursor to further malicious activity.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?keyword=municipal+center+west PDF link annotation
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/nanomegavilisoriwem.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/f3561f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5f9d7d8da3677.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/pujujabopejewud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5f9ee35726831.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/c3c1deb5-aff1-41f9-894e-a4d4fc7b31e8/dr.fone_app_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb08317f-5c21-4ef3-a31b-7a18c95ae94a/62081802442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcaafb1-8d41-445f-b65e-0e675db987d3/mazivozavis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05cc0f6-6995-495c-b05a-9f1c2729f4ae/pravoslavni_kalendar_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c37eb8-6e9e-4a16-89e0-8c92965dd2c5/sajudowuvet.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_off000062e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 4796 bytes
SHA-256: 6f855955306e5e4cb0571a7eda4ae563b6e85df4500104a3ec32597c72c59d18
font_01_sfnt_off0000734a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734A 10416 bytes
SHA-256: e5ab554cea740c794d99ecdb42c32b687c3068658f2aafa56b055f11218cc2c3
font_02_sfnt_off000096e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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