Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251e20a1878215d…

MALICIOUS

PDF

78.1 KB Created: 2021-06-01 04:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3fabc3375920d44ec7632e79dff20eef SHA-1: a0488c1b4c1386d4542396cf80fc5d1ef1e4b6f4 SHA-256: e251e20a1878215d82432cab7e8362f43a82d2f36142e83da16fa53d1c59c251
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to redirect users to sites hosting exploits or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://drafthe.ru/pbw?utm_term=what+does+it+mean+when+your+tv+flashes+red PDF link annotation
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/5f971.pdfIn PDF document text
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/baxuzarusu.pdfIn PDF document text
    • https://wopamogifit.weebly.com/uploads/1/3/4/3/134341426/8558544.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/ebf6c0.pdfIn PDF document text
    • https://buvowanux.weebly.com/uploads/1/3/4/6/134685119/tuteke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5fd7f80835177.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/muzezutaxunuj-xedelazoze-kiwopobeku.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/4157845.pdfIn PDF document text
    • https://voderixata.weebly.com/uploads/1/3/4/2/134266977/2771548.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/wenobuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_602acc53caae8.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/mimalisomuj_valonifasov_sabadabobajaza_mamokejesodegij.pdfIn PDF document text
    • https://turumokapitaka.weebly.com/uploads/1/3/4/6/134613572/4977648.pdfIn PDF document text
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/3e2978263dbe0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcc1bc348697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5ff1412f685d1.pdfIn PDF document text
    • https://fepaxawasebunud.weebly.com/uploads/1/3/5/3/135327574/ruvudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5fd85e000bd7c.pdfIn PDF document text
    • https://vivagijep.weebly.com/uploads/1/3/1/3/131383698/nigizewas_rofawunes.pdfIn PDF document text
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/3640493.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/lakovokugeduzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_603a435b931eb.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
    • 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5296 bytes
SHA-256: 17b7ce6db8c1d8fc01b57c92da20624b3d6ea1c43d9cc5bb108c8365d8500074
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10468 bytes
SHA-256: d0cd306dd150560d56ad2fbb3cbb198c3aafaeb6c73365d6b4093becb54455e0
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e