Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4b8c4b75f7a9c2…

MALICIOUS

PDF

78.7 KB Created: 2021-02-23 22:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1df4c5e655a3bf4f1d54761e41b5504 SHA-1: f395229ba5323ecd990a2748f9cef095a945900c SHA-256: ad4b8c4b75f7a9c2e5bb704ca0d9172e15b18ee2739f80eaf41f3b57193ae498
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The embedded URL 'https://jottigo.ru/123?utm_term=sheikh+sudais+juz+amma+mp3+download' appears to be a lure, disguised as a search result for MP3 downloads, to entice users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=sheikh+sudais+juz+amma+mp3+download PDF link annotation
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/momukadif-runelef-noninubonig-japejegikox.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/acff8f01faa20.pdfIn PDF document text
    • http://copyrightnotices-form.com/cavatina_piano_music3648n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_60298e66d0b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448547/normal_5fee2958a4778.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/2fcfdee0a2.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/nanavipew-batujuliturexuj-koseligeku.pdfIn PDF document text
    • http://chatik85939775.fun/evaluation_sur_les_angles9suow.pdfIn PDF document text
    • http://setofexperience.site/craftsman_4x36_belt_disc_sander_partschio5.pdfIn PDF document text
    • https://vupagivoro.weebly.com/uploads/1/3/4/3/134314863/1713449.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/kesepon.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/wesug-gogan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_601b0245db4af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484365/normal_5fe5451665f7a.pdfIn PDF document text
    • http://takipleskazan.org/rs_herblore_leveling_guide5vs4w.pdfIn PDF document text
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/ginova.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/kukupunopedon/java_jdk_and_jre_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/lowlands_of_holland_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/tazegabadugiraj.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/78665412080.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/uc_browser_free_link.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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5456 bytes
SHA-256: a0dcf539276b3a7b55f48462075dd8e02ba2224c10c7cefa424d409bca980f76
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 11056 bytes
SHA-256: ab469888dcd4af9dc213faeefb7f6b9425ac1835388a0931558c1482fbc711ca
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3