Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b04656cd2fd377…

MALICIOUS

PDF

74.0 KB Created: 2021-04-04 13:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 11302cd65c91fba8e441110edf58063f SHA-1: 205b7d169d410bbbaf06b91d79af6598c37b45ad SHA-256: 28b04656cd2fd3778febe05c213f5a7688d1f4a8b055044698a1b4a1a17e7daf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high score for maliciousness. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=grammar+english+pdf+cambridge PDF link annotation
    • https://cdn.sqhk.co/texojijoraso/djbiaEJ/amazon_seller_central_europe_uk.pdfIn PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/901170.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jdgfieA/descargar_mlb_9_innings_pro_baseball_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/brn6Mha/68298200252.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/1932743.pdfIn PDF document text
    • https://kijeluve.weebly.com/uploads/1/3/4/2/134266469/subolepap_judap.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/gjieqgh/apple_xylophone_ringtone_download.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/zagixokujeraxiwu.pdfIn PDF document text
    • http://vnds-v.website/komozijupoxaxaj90nqt.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/lBdbHAH/migawuveloges.pdfIn PDF document text
    • http://onenature.space/hipospadia_epispadianufqy.pdfIn PDF document text
    • https://bijararavi.weebly.com/uploads/1/3/4/5/134587429/3921941.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/rodobibebur.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/923fd6764650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_e6ebfd8dd35c487095c56a11beeba4d2.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_16cf6977c4484e1f9c795ad1da5b02ac.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_e3db382442b84b988242301967c020c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/salary_of_indian_coast_guard_assistant_commandant.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/fbise_date_sheet_hssc_2019_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/fodipasan.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_3723c2a9ce3848b0b34685764492020a.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5740 bytes
SHA-256: adf077a3cc7b78549adf8657be22d50096b3b2929141afa57cc8bea593268192
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 10948 bytes
SHA-256: a29197e670815f2d4c026b619d3268c9dc4d6b3c90ad28b64a2ba58cf20ac759

Open this report in the interactive analyzer, or submit your own file for analysis.