Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e9d6d9e8a521b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 14:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: adbf95d629286010a7e41e21b713f050 SHA-1: 5fec5f5ba958215840df0926bac30ba8e5da1f5a SHA-256: b65e9d6d9e8a521b5850ea45cf26aa433b535bed3624104f84d90ee035d95ff4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/123?utm_term=common+size+balance+sheet+calculations PDF link annotation
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/d5ac6806f43641.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/iZljgyl/vafogufifiravezutuzug.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/cjaOhce/oil_rig_wallpaper_iphone.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/21c22381b647a3.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ziaRjaK/rock_stone_3d_model_free_download.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/437449.pdfIn PDF document text
    • https://xetebozeb.weebly.com/uploads/1/3/1/8/131872130/bisuronufifikab.pdfIn PDF document text
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/4950261.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/d084401022.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/ovhgthe/maze_runner_books_ranked.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/chfvgiD/nowuzugabasorifisuxir.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/e8afecf0-3310-4b74-b1f7-7b6763cea474/jibumiguxenipirugopet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c61156a-c4b4-430d-9203-a338bc06bec1/matometegisumemivamevo.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_4a97f092b5bb4017818551f8ad902eaa.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_2d72ad7c85de48cc89a1489adc205e8d.pdf?index=trueIn PDF document text
    • http://borogibapomad.epizy.com/burozawujesumulatok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f485d78-7f33-4bd6-ad66-38dcc283a905/rovusimitibudapuxiwitabed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f19ec6b-5183-4e67-b733-b3c3d60150dd/41235339414.pdfIn PDF document text
    • http://lakuxizutigevo.rf.gd/98895389363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a45f53c-1b29-4543-8261-1dbfa8c98bfc/37130036884.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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5036 bytes
SHA-256: 421711bb23d8f9b21b10b50de121217be5d45fbf55ec3c253625d4cdbe30e35b
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 11944 bytes
SHA-256: c1d9b932ffc9281380129da76639e789b8218064b96ee1aca0cb5d9491dbbdc2

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