Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afd0b03c6c7940e…

MALICIOUS

PDF

87.8 KB Created: 2021-03-28 00:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: deadbf1c10e8762268df9946c4fb3d80 SHA-1: 76654f9c2612a4a0a8421496b3f287787a115706 SHA-256: 7afd0b03c6c7940e5d1c909c41a4ed8da089ae204642dd4cffe77b6197268deb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/aws?utm_term=walmart+outdoor+digital+tv+antenna PDF link annotation
    • http://soldatskaya6.ru/411957306748hv3q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ffbb5fda9931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_601f8fb4d9280.pdfIn PDF document text
    • http://grenkasalo4.xyz/what_are_the_3_buttons_on_a_chamberlain_garage_door_opener05rb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fe4299a7bdef.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/a404dc58-fd8a-46af-81cd-b7474743429b/mofidugemopaxopubol.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_ba5bd88a5b9a4c589261598dffd67acd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcec72a-3fcd-4090-9fec-f86dd9af371f/how_to_write_your_job_accomplishments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa741a1d-06db-4261-a059-34094d2d94f2/where_is_transmission_speed_sensor_located.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a550dd4f-e515-498e-9c94-018762d03c5a/autodesk_3ds_max_2011_free_download_full_version_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61c5b8b-5f32-42a7-89bb-7ded91d74c66/rijemepadututud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4474bfb8-6317-4d98-baf5-4d18e4c1e404/tevopetokusoxit.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_30a182ae8dd549ba9520e09981d16642.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_a38adc501e324f0dad893cf1a73b9753.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_c85da4cf1a024fbf93efa26dfc3424ff.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_95eef11255d44d14bbe5c78d869793f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f304f3-171e-4eab-9983-457e1a31a766/sigmund_freud_psychology_stages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7a58f0-3462-4c7a-add3-addc43ea38ac/pathfinder_kingmaker_best_weapons.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_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 5040 bytes
SHA-256: 31f1585c035da355ba98137f9cbf6a59d8e56a185f373e83ebb79e73bf555b22
font_01_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 11412 bytes
SHA-256: 4d3a34943a8a8fa30991a01f8299288f2de4bbc80b756b0d30bee07f52cdc4f5