Malicious PDF — malware analysis report

Static analysis result for SHA-256 f648439a75e148c9…

MALICIOUS

PDF

88.7 KB Created: 2021-04-07 10:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a09cfddaccad31054769abf915bbe12c SHA-1: b0625e8d6aed6893088094aed1e54e951fadfd1b SHA-256: f648439a75e148c93116d71fccdf82001b9e32f5479884fb02708b057d326a10
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://zajinet.ru/wix?keyword=metals+sorted+by+density PDF link annotation
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/xamubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_6027ab5e26788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_60649ff2e3f50.pdfIn PDF document text
    • https://newowuwaw.weebly.com/uploads/1/3/4/6/134634034/zenufe_nezovaj_vagag_bamikev.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/fojofiroku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5feb4dbe62061.pdfIn PDF document text
    • https://zevupizufaf.weebly.com/uploads/1/3/4/3/134315684/lejanif.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/ijcjcey/voxaru.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/ZRUgdje/80s_music._best_free_80s_music_radio_stations.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/hgPjcEB/ga_dead_tours_twd_locations_map.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/xopetasunew.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/gojbbQC/dezozunabiwusojuviso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e9b32a-7a65-4237-ac35-4be10042d869/98144265812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf72b5ed-e417-4522-b08d-41f0062bf223/nabuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a337ad-8120-4869-9555-1d6d3bd10c4b/agatha_christie_books_hercule_poirot_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774f1b42-df38-42a9-b643-a08dca4ae6d1/57185978439.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/ragnarok_eternal_love_acolyte_skill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/58936156044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07dea5d4-f65d-4397-ab57-5da2f9f50a42/global_history_regents_essay_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/14550503838.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/glass_antiqua_regular_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192d6f41-38ee-4760-9592-7289c22ee302/luwogesexabafos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db38d89c-f45f-4bdf-88fd-c22cda95aafd/nilawepaforavukidul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c708316-af96-416e-bfdb-5d0c9f6555f5/stephen_hawking_young.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/ratio_decidendi_and_obiter_dicta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d94293-8da8-480f-b6ab-87d1545997a5/xivesuvowitezamodukelabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baf900f-2001-4adc-adb0-91949a3dec41/zoporapigemapazurix.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_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 5064 bytes
SHA-256: ab83bb05cfa8c5cb647da182460144e911716b227b0b585215d9bca255e478bc
font_01_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 11736 bytes
SHA-256: 145dd6b6279b55cdaddc4bc390e55a8d242593f7d7b52d495b0f0d1ff983186c