Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc21e9c379bc13b…

MALICIOUS

PDF

45.6 KB Created: 2020-10-15 23:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 755faf2f1bb54b128427ddfb00a39230 SHA-1: e4bbf07a063f1b572139421033be793c420bec7e SHA-256: efc21e9c379bc13b8452a167a4b231fee9b397fd328763cab4c439a8a167e241
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of link farms, with numerous embedded URLs pointing to external sites. The primary heuristic firings indicate that the PDF is designed to redirect users to potentially harmful content, leveraging a known malicious redirector and disposable hosting for link distribution. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://ggtraff.ru/123?keyword=manual+leica+disto+d510 In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wozumadaku-mukevewurovebu-nefebo.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/jatelu-zukolugaw.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/guzakevaped-dodaxu-turuzaz.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/runemevurexuziwone.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/24e248e6e441.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/woxuzobusijuxur-bazomebuzib-tifivegowoxop-vabeleg.pdfIn PDF document text
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/c63c3386e.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/78ec56c.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/mikesigubujeki_gerogosiw.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/3977069.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/2773308.pdfIn PDF document text
    • https://site-1036981.mozfiles.com/files/1036981/soxopijagif.pdfIn PDF document text
    • https://site-1044115.mozfiles.com/files/1044115/33449790271.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/3c13fd2a-9ec7-4b65-bca0-9418a19bf3fa/14943068556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848b2f28-a147-4dbd-bcea-58e12eafdad2/funus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5708e5aa-d678-4cff-b7b8-912682780085/sapifogejegowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426f15da-06f1-4425-a2b4-ef2403658c5a/muzofivodukubexizefumejiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ce3b30-3324-47ec-9709-92276d859c47/9018306221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90306549-9f8c-4d2d-a5b6-74f0beaa57a0/98488581216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e816c0d-6762-4d80-aa6b-14f9db5c150f/ninabitumozebogo.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_off000068e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E0 5160 bytes
SHA-256: defff1ef38e8bf4ebd6ffaa12eb8cbd2ce51e2676622db18dac012d43b415b76
font_01_sfnt_off00007a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A88 14656 bytes
SHA-256: f281bb99ca5217359ba92af1c262687ecc9d141e08d4c5f6b14a3a837f65c854