PDF malware analysis — malicious · 441fe457afaebdbf

MALICIOUS

PDF

66.8 KB Created: 2021-04-22 22:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 2978fb7eed5b4c32c547ca1972c9cda6 SHA-1: f022bbab957cb7d7417638e0f7702a45be43d4d4 SHA-256: 441fe457afaebdbfe624a4169738aac9a60599eefb9f2773c8f7ae038815f44e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://www.afscme65.org/system/files/webform/tikat.pdf In PDF document text
- https://ambrose.edu/sites/default/files/webform/7968200385.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/42416127327.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdfIn PDF document text
- https://www.enwidth.com/sites/default/files/webform/resumes/wefegazeketalewawer.pdfIn PDF document text
- https://www.blplegal.com/sites/default/files/webform/piselusani.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/82598578892.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+complete+inside+the+deku+treePDF link annotation
- https://printandmail.princeton.edu/system/files/webform/67925993666.pdfIn PDF document text
- https://printandmail.princeton.edu/system/files/webform/42849177422.pdfIn PDF document text
- https://minorsoncampus.princeton.edu/system/files/webform/fujixedapilevunagujos.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cb64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB64	5220 bytes
SHA-256: `ab429ff7ffd7fae06557162e9373452c86f692830985bd05602c135eb38e0f98`
`font_01_sfnt_off0000dd05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD05	9920 bytes
SHA-256: `f029164edf1630ccc0a53bb1c245fc0a7ff79bfecae223239734d483637a0eb8`

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