Malicious PDF — malware analysis report

Static analysis result for SHA-256 b479768bb430403e…

MALICIOUS

PDF

98.5 KB Created: 2021-04-21 18:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 465809e951311b558de63d1d9c91f94b SHA-1: 27f0248368ec7ece3adb63c26761d875175416cf SHA-256: b479768bb430403e8365117c066ab48ad820a0d277822627fb444380ffd44c4d
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are on disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. While no scripts were extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://leonvi.ru/strik?utm_term=what+is+the+correct+order+of+the+5+stages+of+group+development PDF link annotation
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/didovi.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/interior_design_for_small_house.pdfIn PDF document text
    • https://fexowisidirap.weebly.com/uploads/1/3/4/8/134868585/pemakubojolefaz.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/kimorimagek.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/samsung_scx-4623f_scanner_problem.pdfIn PDF document text
    • https://wikifezetusu.weebly.com/uploads/1/3/5/3/135306480/tatidijoduge.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/lokegaleginib.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://s3.amazonaws.com/jadudusujuje/blackbird_song_by_beatles.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/88009563033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddf3ac7-e1e0-4a0a-b469-8915a81f72ec/geralds_game_full_movie_download_moviescounter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331054a5-80ab-408b-8dc4-7139d7cf0a63/nuratijurunaxatovu.pdfIn PDF document text
    • http://tiwedozesa.atwebpages.com/lldm_cantos_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/55534095567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d8f23b-e395-433e-9530-e08cdcda38ea/jasurofizagegota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e471ba79-5526-497a-8a30-aacc8f73543a/wuvujevasevapudekipivel.pdfIn PDF document text
    • http://ziresam.rf.gd/alif_ost_mp4_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8b8a56-d93a-44fb-92b0-6663de8db05e/what_french_words_are_used_in_english.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/vofuxe.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/56012462645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0448f4e1-c575-47d1-a904-f2e25808d422/resumen_de_rayuela_de_julio_cortazar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89edd39-3e19-492e-be5d-65300e9acf20/50932518738.pdfIn PDF document text
    • http://kibomopog.rf.gd/75899001566.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 5648 bytes
SHA-256: 85e4de632b05fae86a62bb49de7a4ffcecf3cffce2709faa059c1c03a111d332
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 2268 bytes
SHA-256: 72a3fe65f0a21df30f240897224061cfa351088b80a4eb601fb5defb198ec993
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 10992 bytes
SHA-256: 90125bc992c2018a572856a97c059802d3ad319bb60e838857f5b19277c31951
font_03_sfnt_off000157bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BD 16212 bytes
SHA-256: b611962d0e4c9bf88f96436cdcf5830763d6e359d9043a856593dbac5033b005
font_04_sfnt_off00016d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D10 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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