Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b1d80f79104e1d…

MALICIOUS

PDF

77.6 KB Created: 2021-05-15 09:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3f07f1cb2ffc5c200f58a0797f364863 SHA-1: bd1ad21e768b7d941c3672a6e0472962e6f730cd SHA-256: 38b1d80f79104e1d306f1f22948dde910a5f964b7547518b00ac2b4cb04c4c3b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to technical information, aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+to+set+a+skyscan+atomic+clock+88909 PDF link annotation
    • https://cdn.sqhk.co/gigatakel/jJjcPTb/82573987877.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/aortic_regurgitation_pathophysiology.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/miaThe2/20468497767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6016145cb32f3.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/SiaejaD/net_application_architecture_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5fcf605fc76cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_60291bbc2aa32.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/idXghY1/58564087592.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/kingsman_the_golden_circle_full_movie_download_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hge29oO/green_pantone_color_of_the_year.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/xezivorapobidebomolemita.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hfYidha/call_of_mini_battlefield_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5ffefa74a49a5.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/icjajcn/lifonebijumegamo.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/ieieSWI/tatobidezadusixeko.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/jfQboVt/sword_coast_soundscapes_curse_of_strahd.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/BONieXk/92859606325.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/Bxggjb2/tiwupideli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nepogewapiw.epizy.com/12331119228.pdfIn PDF document text
    • http://pevudavef.rf.gd/pogazorunus.pdfIn PDF document text
    • http://maferodo.epizy.com/alaipayuthey_songs_tamilwire.pdfIn PDF document text
    • http://puriruf.epizy.com/typographie_a_manual_of_design.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/faktor_pendorong_urbanisasi.pdfIn PDF document text
    • http://lexalerov.rf.gd/precios_circo_de_la_chola_chabuca.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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5560 bytes
SHA-256: d6c6aef70d31971394f30fa8393ad85f79a65fc6d31ed5a008764a14cac9aefb
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 10376 bytes
SHA-256: dd96a822afee8daf1d0263eae3512fe7c34b0d79da478bd61e2d6d853a9fe7db

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