Malicious PDF — malware analysis report

Static analysis result for SHA-256 603ba919ae4e6aa1…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 15:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e94c1a74429bdefb9ca252028adb4107 SHA-1: b620b7096d65e6d57a77b5be1ee51287908bc42f SHA-256: 603ba919ae4e6aa125159232c192813b28b3bb0b64f4683001c00eb4b089fbb0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a link farm with numerous external URIs, including one pointing to 'gimoguvi.ru', suggesting a phishing or SEO manipulation attempt. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=railway+empire+manuale+italiano PDF link annotation
    • http://vizexibidoxi.getenjoyment.net/a_color_of_his_own_lesson_plan_preschool.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/woletosudugo.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/lurutopobi/vedenabik.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_f6f6bbb8ab1541af846ec0337ba0a21a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c06ef0-dc30-4697-b2cd-7528e1b04299/how_to_do_a_self_hypnosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34fa099-f9a8-4838-a520-2b183b9cb0ec/dramatic_irony_examples_in_romeo_and_juliet_act_3.pdfIn PDF document text
    • http://gafodix.myartsonline.com/49730462521.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/hypokalemia_correction_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/pomifiradofajavuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cb6f00-6e98-446d-a5d5-244aac8e86df/strymon_deco_vs_el_capistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a45790-33a4-4c27-aaf8-83a0a76860b6/how_to_connect_hp_deskjet_3051a_wireless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d70897-90b1-4f2c-847e-235f015cd5a2/rheem_power_vent_gas_water_heater_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/wugejapalijifu.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_57d88790500d49da94bec9351e46e922.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcce438-7c02-4df1-863c-f0e8bfbf0897/can_you_sleep_with_daily_contact_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11f16a6-a362-4a7f-9f97-fefce53b7365/cuisinart_burr_grind__brew_-_dgb-800c.pdfIn PDF document text
    • https://fa4f062e-6358-4c1c-b254-10e413232adb.filesusr.com/ugd/2f8cea_d63bfc3fb5e540098718366e070151a2.pdf?index=trueIn 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_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 4988 bytes
SHA-256: 913ad270cded5de97c2f8b340e978675ba4031837cb243e162f8468555bba09b
font_01_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10480 bytes
SHA-256: b79810e5d77bd6da00fcba8ca1b01ec2c1170993c1b56a6ce792dadefa8fce00

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