Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9734a3440a5d8…

MALICIOUS

PDF

73.9 KB Created: 2021-03-13 21:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1d0e47faf8b290c6ed14f9edcf49deae SHA-1: d1beb1af4b49e36ead51aa73c710ee36e2fc5f61 SHA-256: f6b9734a3440a5d8035ac9845be83c7457ae337caf929c5bc873c433db7a9ef1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to be junk data, but the presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://soxebez.ru/award?keyword=table+tag+in+html+with+all+attributes+pdf PDF link annotation
    • http://tricitysikhs.com/1_to_100_multiplication_charty1hvu.pdfIn PDF document text
    • http://car-den.ru/tijalotukezuluzogonuluvuiovp5.pdfIn PDF document text
    • http://prodson.fun/lee_county_fl_school_calendar_2019-20erhoa.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/124341.pdfIn PDF document text
    • http://raisinshq.club/korumufasekomogeloxubap94jqv.pdfIn PDF document text
    • https://genefitagujutun.weebly.com/uploads/1/3/5/3/135392589/tekepegel.pdfIn PDF document text
    • http://natorg.space/sakura_school_simulator_2020_mod_apkqtwni.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/jepojo_goxin.pdfIn PDF document text
    • http://bobr.space/89640214209hzfis.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/jiwipe_bowazij.pdfIn PDF document text
    • http://cheatyou.site/92806868922ep2n.pdfIn PDF document text
    • https://xevoniwibefi.weebly.com/uploads/1/3/5/9/135984774/gugigofu_kemig_vekuf_birorixo.pdfIn PDF document text
    • http://gordei2d.com/avery_label_template_l7159xdp55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_df3cf900ca1f4d6dbb4ad59b5b13440c.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_9b8b4f1346ae4efeb6641f2c1c6e0e27.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_4fae44bda20347ce9c0bf6b3f5bb39ac.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_5afdb90a215f467fb1d9a37c8f3cdf2a.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_637bff32e0f84a0598a2750b4e8afc93.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_20441ea5d0ac48ceae49ef24b6257a31.pdf?index=trueIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_218164e06c3643389e32a2a69365df55.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_d80aa3d28f5944dd955bd852b46a2962.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 5636 bytes
SHA-256: 1cd021d7d40cddb6b6351d8a80982d67b975766ecb4bdd79667b290937712ae8
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10700 bytes
SHA-256: b1ef5b80da6a67001253f1cb77e375c7748368b8321094bc1e60989bf1026555