Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908d02fa6f1930d…

MALICIOUS

PDF

99.0 KB Created: 2021-03-25 10:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 81f514a5daa45764cac59326e7052786 SHA-1: b0b5fc747d8154c782d0d0fe4134e502096d417f SHA-256: 5908d02fa6f1930d21d51d649a2a1eb76ba33764d48fc2d125b52df296504486
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous URLs strongly indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://crophysi.ru/award?keyword=blend+for+visual+studio+tutorial+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5feb7c179f9e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_60372fc9a1b43.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/4660317.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/27408792180.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/nixeberu.pdfIn PDF document text
    • https://lejiwukepefi.weebly.com/uploads/1/3/4/4/134467113/tutigowi.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/physics_symbols_name.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/cardiac_rehabilitation_textbook.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/potaka.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/9056302.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/mupemowanigo.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/963e3722f2acc17.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/8263649977.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/stock_markets_fall_around_the_world.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_604cb6c78cc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_602e67013e0dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://niwimugosaz.onlinewebshop.net/home_design_apps_for_iphone_free.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/4943044369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5966fdea-bcab-473c-bb06-1110ec6e1184/how_much_does_it_cost_to_fix_water_heater_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c79ffbb-437f-4ecf-b963-93b3a188862f/the_magic_flute_song_lyrics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 5024 bytes
SHA-256: 9010adcaa8b4d409b3640b7a8aa69b9c067c6fca53f95000ecfd61438db18463
font_01_sfnt_off0001497a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497A 11316 bytes
SHA-256: e4bc1025f4177e7bd046ad384df360db1fd1f791d84c3f1b1587344435bcee0a
font_02_sfnt_off00017040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17040 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34