Malicious PDF — malware analysis report

Static analysis result for SHA-256 78972b0ef7201882…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 06:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e570b487533d0db6adbb9bebe693f7d3 SHA-1: 089a9af135d2e109e98c73a7bdbc7f58ec414e66 SHA-256: 78972b0ef7201882b6ce58020b7303e6bafe1ce1299c22e7e5ff355cf7343f8b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable or suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation to distribute malware. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=netgear+wireless+bridge+access+point PDF link annotation
    • https://cdn.sqhk.co/pinepopowig/Fjagdgg/candy_ring_pop_molds.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/tasujozuligude.pdfIn PDF document text
    • http://dajexori.mypressonline.com/41752942543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_6010a2734a0b7.pdfIn PDF document text
    • https://kuwisuzom.weebly.com/uploads/1/3/4/0/134017610/piviw.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/4090024.pdfIn PDF document text
    • https://tulebowad.weebly.com/uploads/1/3/4/4/134467329/zumegoxamukubimo.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/ihcKmjj/15334037901.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/gijAzxA/sufega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5ff8b8d964263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_6003d162a12c2.pdfIn PDF document text
    • https://revoninutilira.weebly.com/uploads/1/3/5/3/135338282/8928136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_602e3f4d40245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_60018ad705559.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/fortune_at_the_bottom_of_the_pyramid_download.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/8659671381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadeboni.epizy.com/fdic_real_estate_ltv_guidelines.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_ca34af02837b4c88a0ee8bd12b33911b.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_b535692ef50c48028856779a012be554.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_6314ab33a0f447c2bb0f69eb77318e0b.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_c7962ad228ca44e7abfc10f7ca80d781.pdf?index=trueIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_5513ec06ca9d4a77af2ace30321398f1.pdf?index=trueIn PDF document text
    • http://wugorasu.rf.gd/vizio_s4251w_b4_wall_mount.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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 5444 bytes
SHA-256: 1ec0d072adb30e5121da386aa8697a9a434ac5615bba2a374715a4b6b292df59
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 11964 bytes
SHA-256: 50c9fcc3efb54f432fc8574f67c60d8be45adfc5da0eb32573fd4c3e30dee301