Malicious PDF — malware analysis report

Static analysis result for SHA-256 2600eec0aeb02e88…

MALICIOUS

PDF

91.5 KB Created: 2021-03-18 17:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 558091070690f6eff2ca4cf4d61b4d1f SHA-1: dfe689b369da4b71864f14d3d60ff0ecc54d4855 SHA-256: 2600eec0aeb02e88a21734c7782abbada714d1a4f463afc0fd74bc1c5bfa8575
254 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a redirector link to 'yafferge.ru'. The document body, though heavily obfuscated, contains text related to 'Tera online sorcerer guide 2020', suggesting a lure. The presence of numerous external PDF links, some pointing to benign AWS S3 buckets and others to the malicious redirector, indicates an attempt to distribute further content or lead users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/wix?keyword=tera+online+sorcerer+guide+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_604718c9e0a5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Ffiai6A/kegofixumudidinisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5ff30e9146339.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/g40gegh/nintendo_switch_parental_controls_master_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_602e1a6d90cd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nigimul/dateinasia_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/amliorer_mon_franais.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_be0f7d8b8fb049f382203e9abd63036b.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_c8c06082b6574668857b18ce3b9c6dba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/fafoziluvode.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/livakurok.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/nupudekuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/holmes_1_touch_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/safe_drive_save_life_report.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/monegexoje.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/nenalatatitarofupaxebuw.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/free_sheet_music_come_together_beatles.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_c0b92b05b4e947c8bb6c9a29e0bdae43.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_8d706df47c15439680cc61532129cd00.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_9282f8208efb4bc4ba1386eeab459b65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/zamofuwobemivumi.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/introductory_statistics_try_it_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/how_to_connect_canon_mx922_printer_to_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/98085187547.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/dell_latitude_e6540_specs.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_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 5328 bytes
SHA-256: 1884bef1a3a65b52499c113badb42180d010f1a6fc3ef7e1cd6ea745525719e7
font_01_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 11204 bytes
SHA-256: 5151db753986b23e214691ebcd440202a1f1a13cfc83397accf28fecd3664488