Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8225343592dc07…

MALICIOUS

PDF

93.8 KB Created: 2021-04-23 05:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5ca1adf6a2d120ce45e45e6e5de0cbdc SHA-1: 27df11ef76a802ac094f3d3a4ef2d7de95df6cd6 SHA-256: 1d8225343592dc07a6ce79c117247ab9d7487d59f9b9727690568d6d2addbe15
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to a potentially malicious resource. The PDF's structure and embedded content suggest it is designed to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=flowers+for+algernon+movie+adaptation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450351/normal_6031badf8deea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6053281a91c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_606e5bd4a8cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_602e80c94d848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5feb43c495d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_ecc311c2514d40aaab46f3abdca80842.pdf?index=trueIn PDF document text
    • http://tirixerunifadi.rf.gd/lose_yourself_remix.pdfIn PDF document text
    • http://japixunatavaxi.rf.gd/mubarunopawojomuvifanu.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_e9705aeaff2f4c78b8eba4cccf7bad75.pdf?index=trueIn PDF document text
    • http://gotenekopibijo.epizy.com/avengers_endgame_ost.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_8cb5956b8b1445d29ddf37dea79106f2.pdf?index=trueIn PDF document text
    • http://merererunovud.rf.gd/bienes_muebles_e_inmuebles_peru.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/ferebo.pdfIn PDF document text
    • http://votuvut.epizy.com/puxevasigozim.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_19db9860a6de41c9a77de2debe08f01c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/bitdefender_box_2_user_manual.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_c7b6caa47a8b444198a55e02935770f4.pdf?index=trueIn PDF document text
    • http://xaposekesudonod.epizy.com/wojumegonodo.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_a3c819bd88c2496099edfdd10210c924.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_9a59585954a24de886993f78e586ea6c.pdf?index=trueIn PDF document text
    • http://tugojolowok.epizy.com/guia_ada_2018_espaol.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013273.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13273 22568 bytes
SHA-256: 920120e45f61a54ce763d98efc728ddbb17c860c36505c1b9d9acbdcb4d9eff0
font_00_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 5256 bytes
SHA-256: 943e523cbbdac0bdaf9d139dcfb0065d2ab6b1e5b3dfb655ce816a4b76dba4e4
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10584 bytes
SHA-256: d556a0ca20a70e37573f3ed25cb445aa5264d5dc7d6f52cd220d60ffae12d993
font_03_sfnt_off000158ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158ED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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