Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfe83258152d052…

MALICIOUS

PDF

76.5 KB Created: 2021-03-09 00:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 10cb89aa5bfab877ab2437a5b0091282 SHA-1: a90f8c5037e95602739daff21c233cb33e078e86 SHA-256: 3bfe83258152d052ed414495eb16286d42f718fd9ae8bc793c8b8cdd84a02af4
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 identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/123?utm_term=android+sdk++for+pc, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=android+sdk++for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419650/normal_602ce09121117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fe44862db62d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601a010f165c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_6030dd7740281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_60435c29a4859.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/tozud.pdfIn PDF document text
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/kudaliligo.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/limivezibajazas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_e44e749ca9214fcbb76aca8f67e3a138.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_3e098c35ba5c4a4d8d17f7cfd7991845.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_f2ddeb82a39c49d491f15e46055ac334.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_f9c6d0881c244f039a71953c6608af33.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_dcceaeab284f4982ac547d9f0d16257d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6407ae3a-c9bf-4330-af70-8e70d7595735/sas_proc_univariate_histogram_axis_label.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9156978e-83b1-4fd5-a8fd-0301292979ec/gigagazipakapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed01edd-d205-4cd2-8f1d-8bc94cd367d9/47095784677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3efb872-0bcd-464c-a87d-f318ba0a568b/what_is_difference_between_reference_and_pointer_mcq.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_a1acc375c35747049f2f86e5775f02ca.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_9348a8964176418fb0660a49cae7fda0.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_731b4f1360554ce1b27eb20cbcedc930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fd3126-3ff8-42ae-b00a-73af713fd48b/programa_de_estudios_2011_secundaria_espaol_segundo_grado.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_d784ed176657413bb7884ecfbe183837.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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 4960 bytes
SHA-256: 971a145522649fa0ea9676cc95d88b439f1b7502726d5c5949e3d12b1e2157f0
font_01_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 12368 bytes
SHA-256: 7eb233ab43e7919cbc5b20e76e3893c65f75066f678b5634a672895e94110386

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