PDF malware analysis — malicious · f1a7cf5293f6c15c

MALICIOUS

PDF

64.5 KB Created: 2021-01-25 13:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a55233fc7e4eb92f46b475c485a979e3 SHA-1: 7a4687403387d0fa2c02d07802fdf60610cd772f SHA-256: f1a7cf5293f6c15cbfdfac0e2bfd68d940018a9d10028965b6aee21ca47b2161

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It contains a large number of external links, with the primary URL suggesting a lure related to educational worksheets. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a potential SEO abuse or content distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
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://trafficel.ru/aws?utm_term=meiosis+vocabulary+worksheet+page+11+answers
- http://brumbum6.xyz/fake_girlfriend_call_prankzt4ms.pdf
- http://teleporttur.ru/occupational_therapist_job_description_uklgxmx.pdf
- https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/58ec24011.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://kojosire.epizy.com/nuvopesamotuxajopoliwixu.pdf
- https://s3.amazonaws.com/veraxawewib/bubble_shoot_apkpure.pdf
- http://borinalujid.epizy.com/pipuxofuwekoriwoxuvulupov.pdf
- https://s3.amazonaws.com/wurivuve/first_grade_worksheets_on_verbs.pdf
- https://s3.amazonaws.com/nigimul/avast_antivirus_for_pc_windows_8.pdf
- https://s3.amazonaws.com/gekixadonuru/51205223733.pdf
- https://s3.amazonaws.com/limewub/45893521479.pdf
- https://s3.amazonaws.com/dixaleko/roteiro_cerimonial_de_baile_de_formatura.pdf
- http://foripoj.epizy.com/air_cooler_project_report.pdf
- http://dimafox.epizy.com/android_custom_action_bar_menu_item.pdf
- https://s3.amazonaws.com/rupatojuko/9856711165.pdf
- https://s3.amazonaws.com/setigafat/tchibo_cafissimo_latte_bedienungsanleitung.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bbf6.bin` `13a6158e644b43e54d216495abf0126cc921bbd8d22e31242aa29f9814741546`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBF6	5712 bytes
`font_01_sfnt_off0000cf90.bin` `205376334af3520a5fd3635b152c3654c2ea7e1b11ef0ad3c80ee84b3aae0ea9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF90	10364 bytes

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