PDF malware analysis — malicious · bb42bc2e1c27bd77

MALICIOUS

PDF

81.8 KB Created: 2021-03-11 21:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a9f6c94ad1eac482f8ebd850efde7ed7 SHA-1: d40c88cd4391fcfced534727d7f07aa0cbd0a735 SHA-256: bb42bc2e1c27bd77e326636dc61468f3170ae819eb83abe93b1ccf55af77a9d8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain ('bologen.ru'). The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to relate to educational content, serving as a lure for the embedded malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=8-5+dividing+polynomials+answer+key
- https://static.s123-cdn-static.com/uploads/4383308/normal_5fe46da79998e.pdf
- http://mir23.xyz/zunakofokuzerowikegag4izlt.pdf
- https://cdn-cms.f-static.net/uploads/4407562/normal_60145b75e6470.pdf
- https://cdn-cms.f-static.net/uploads/4369161/normal_5fd1bd940da6f.pdf
- http://helpcontactform.com/rci_2950_dx_for_salee2e80.pdf
- http://wipineda.iblogger.org/free_html_templates_w3schools.pdf
- http://witotikumuw.22web.org/binaural_beats_apk.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_9418593de5cf4cbd9757feee869ad040.pdf?index=true
- http://kezulixu.rf.gd/how_to_install_sim_card_in_cradlepoint.pdf
- http://bamasagure.epizy.com/work_certificate_sample.pdf
- https://s3.amazonaws.com/jeduzizonox/charice_pyramid_song.pdf
- http://nigabosepa.epizy.com/guidewire_claim_center.pdf
- https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_6fadc23eb243426ab84d728ac5eec950.pdf?index=true
- http://joxelexudar.epizy.com/67987211211.pdf
- https://s3.amazonaws.com/bikikanafopavu/dinereb.pdf
- https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_ae1f553bbbe94a9d82f7e8f5fe5e7600.pdf?index=true
- https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_aed198126dc2410ba3025d90dbd2d3ce.pdf?index=true
- 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_off0001019e.bin` `a104aa4a1b4ef5ae85dd8656e8db47c5ced4c931d593294d839552e4276e3197`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1019E	5852 bytes
`font_01_sfnt_off00011595.bin` `7c27ad61239b6df7ce690f1a46c0a5bbac0432b9d8ac993701dc7ad323d276af`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11595	10484 bytes

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