Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49e8a83793ba413…

MALICIOUS

PDF

91.8 KB Created: 2021-03-08 17:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e60cdc6870f46e25d4090723ca6429ef SHA-1: de73ac9c1c1d89787a71c8e92082d6b64879fff4 SHA-256: a49e8a83793ba4137a3681d39840838e9e9dab4adc3cde3018ad00fb2dfc1d44
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, characteristic of a link farm or phishing lure. The presence of 'utm_term=best+1000cc+utv' in one of the URLs suggests a potential SEO manipulation or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=best+1000cc+utv PDF link annotation
    • http://wobixoka.66ghz.com/zenaruduzolekozexugolijaz.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/hr54-200_vs_hr54-500.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/fonorebapiwuwedaruxilexug.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/gulafupew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_c0b166f24e414f88aaa43c2d79398d24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwara/how_many_pages_are_there_in_the_fault_in_our_stars.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_24d9a7ee6df149f8850a8541e9e7927f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3921a4-aea7-4eb9-b975-f4173b6758d5/how_to_install_zotero_in_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5878ca-63d1-4614-95b1-ab40dd749f3a/whatever_tickles_your_pickle_phrase_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5c0b7f-594c-47ca-aa8e-083abac03312/dojav.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_983ee19a71cc43d5b45234140d7eb39d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aadffc2-d6ba-4dc9-81c4-cc3e8bb2abeb/by_the_waters_of_babylon_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccf3e40-e0ac-411a-91ba-062ea853a342/xudexodepunefo.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/23634826024.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/asi_hablaba_zaratustra_resumen_por_capitulos.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_a1dd81e4386e400286fd0fdf70b60de4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/cardinals_injury_report_nfl.pdfIn PDF document text
    • http://gafejufojivu.epizy.com/router_setup_page_apkpure.pdfIn PDF document text
    • http://wijobave.epizy.com/zufexawofunukate.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 4756 bytes
SHA-256: c81a4980ae126ed50b382ae83a1c288fd662230ae08efa57af7d9565210d00e0
font_01_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00013c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 11060 bytes
SHA-256: e845f39e754ca6f3d5a6dd8ec1f9085a479b64de3592c3590eb1b5e219f1ceea