Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2dbf50136dbb3e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 08:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6b6e1ff3614bc4f716aef31980b26b58 SHA-1: 120fc8160e75434908e66bf7a62ac2524d94cd94 SHA-256: 4c2dbf50136dbb3e310984b70bc8404d6665b3a532f65f04dbbd5cb86fddb0a0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'gift cards free gift wallet apk', aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=gift+cards+free+gift+wallet+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476010/normal_60374c9daf598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_605027366bde6.pdfIn PDF document text
    • http://jujesunojos.22web.org/procare_humidifier_filter_wf813.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/a8ddd458-db7b-436b-a46e-f864658aa454/65750007011.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/ib_english_language_and_literature_ioc_guidelines.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_6cb74470d50043e1937edd5b721a8ab3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4642dc2-bde2-4180-ace6-97c2502efaad/19775695250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18ccb8d-8393-4528-933e-55087d903d37/dd_way_of_the_four_elements_guide.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_066e1328b51e4beca2e19ba1fa83ee9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dbacd3-2e89-49b8-a8df-29ebfebe2d70/12353207207.pdfIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_b80afbe8578545ceae3dbed6ca3f1fbf.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_f180f703e5b94ae689aa612ab5bcf7e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20e4f95-2c6d-426c-814a-62e8347fde44/what_does_the_poppet_symbolize_in_the_crucible.pdfIn PDF document text
    • http://wolevovugubim.epizy.com/msi_970a_gaming_pro_carbon_am3.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_91c507f469f54624b6b961cefce3d28a.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_e3cab0b07f2e42b68f8f64ce4cb22805.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de97d7ba-09f5-4aab-934e-1bcb832e3adf/best_plugins_for_fl_studio_trap.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_6b7cc9c8ce2d47e8b786ce4671e277a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cefd76-c682-42cd-8a92-7b67a6d04496/66686611392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ca1561-9ca0-4af7-99f0-af576ccab52d/is_greenworks_pressure_washer_a_good_brand.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5508 bytes
SHA-256: d9ff8b0832bba538ba307d413a4aad5340dc7e767c25a2ae8da5a66f9920c76f
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 10936 bytes
SHA-256: f14f62380448b7795bb5c754026a8fd768c6afa612e326d46a02dfc18201ec28