Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce1cd897ac1ed1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 20:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 01a60842474732af3ba33909dd6b5536 SHA-1: ea4eb5b5224426d628df85decba4c787aef7979a SHA-256: 21ce1cd897ac1ed12a465964dc159ce7932e9d56127389bef91640e467451544
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/123?utm_term=car+computer+diagnostic+software+free PDF link annotation
    • https://cdn.sqhk.co/kajurineg/jdbicjj/joplin_live_weather_radar.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/mujeda-dodeve.pdfIn PDF document text
    • http://pedrons.space/2914481243gvcqc.pdfIn PDF document text
    • http://love-cosmetics.shop/company_of_heroes_pc_games_freeqdg7p.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/craftsman_electric_leaf_blower_vacuum_manual.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/tcp_ip_internet_layer_functions.pdfIn PDF document text
    • http://infonewstravel.com/sap_business_case_example8lclu.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/dubogusafufeta.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/585518.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/e7x49Px/51997965543.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/omsif3C/19427721421.pdfIn PDF document text
    • http://mx50off.pro/352021158731fuhu.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/3e5da64a9c00f.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/naxerorog.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/0f2a5cc9-56c9-4d57-a4c6-87b5d0f6751b/cupid_and_psyche_story_map.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_9e55f7b8fb544f30a99e3ae10a60228b.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/4078974681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96db1db9-d3fe-4bdd-9ce7-0338a7269463/how_to_download_the_sims_3_for_free_on_mac.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/9141233551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20d50d0-573f-43e2-a180-c0a578f08db6/5661197113.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_7fc49ba1e58b421c8e03ede307b898f7.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_28486ca6bcce43b8b9c704675f4bd19c.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_068b9d441bb044b3a52f5e87d93e1dbc.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_c52f7d7aafac42e7b974bead68b8f82a.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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 5440 bytes
SHA-256: 76fa2d389162e55fd6dd003c02848bef77b4b1f386ac1103a65c2d693130e33f
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10308 bytes
SHA-256: f1523fef979c51c093e3b8106895e171a365dc3d8bcdb0e64d783e3d6bd6796e