PDF malware analysis — malicious · 4d6f5ad8f402c686

MALICIOUS

PDF

111.9 KB Created: 2021-03-15 17:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: a5cfed1d8bf9d22bb3b7542a1ed40411 SHA-1: 2927bce140b19d39e596e09d09ac98d9023f1757 SHA-256: 4d6f5ad8f402c6865985c2c25df4e7154b35fdfd4bf7de3de63f473866cfb2b5

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Humayun ahmed romantic book list'. The presence of multiple disposable hosting links and a critical heuristic firing for malicious redirector links strongly indicates a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://yafferge.ru/strik?utm_term=humayun+ahmed+romantic+book+list In PDF document text
- https://cdn.sqhk.co/vexedobasof/5owFhd6/rojamumakonowex.pdfIn PDF document text
- http://helpforteam.com/dd_monster_maker_downloadz47bv.pdfIn PDF document text
- https://cdn.sqhk.co/suxavawudomo/jJicPgg/cyber_hunter_apk_android_oyun_club.pdfIn PDF document text
- https://cdn.sqhk.co/loganidob/rOAjgMc/72310848035.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4380072/normal_5fe16d05e531b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4487197/normal_6023a8d473524.pdfIn PDF document text
- http://rrrrkkkkk.space/hylotl_underwater_cityuds8p.pdfIn PDF document text
- https://cdn.sqhk.co/marelagixe/ilAhbMh/dasivafibuterenida.pdfIn PDF document text
- http://kmplitka.shop/kumon_reading_worksheets8w5yj.pdfIn PDF document text
- https://cdn.sqhk.co/ninubisidire/hsJiid8/dragon_city_heroic_breeding_time.pdfIn PDF document text
- http://idealslimitalia-oficial.site/how_to_leave_afge_unionav1q8.pdfIn PDF document text
- http://vandify.com/8785523385390z5r.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_9ac2c16e528247fd9b6b837e050af247.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/badodemebo/93969517544.pdfIn PDF document text
- https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_e3e87852365d49cdb9e290fabef0c9ce.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/libeganot/bitsat_2014_question_paper.pdfIn PDF document text
- https://s3.amazonaws.com/godewumazek/84560509361.pdfIn PDF document text
- https://s3.amazonaws.com/lupuvogotog/how_to_show_interface_errors_cisco.pdfIn PDF document text
- https://s3.amazonaws.com/towutoginadivu/vajati.pdfIn PDF document text
- https://s3.amazonaws.com/gotijejaj/atf_box_latest_setup_12._60_free.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
- http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
- http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00014c48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C48	5444 bytes
SHA-256: `8bbb5cf274ad77432c805f0ebd2b3f99d87a78980993f66b1047f4b0523f632b`
`font_01_sfnt_off00015e98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E98	14144 bytes
SHA-256: `121eb7312b8566ada2c44f9c4b0962b3fe14d683e818d07618f9cf841bfaf510`
`font_02_sfnt_off00018acb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18ACB	11160 bytes
SHA-256: `fa2f565263a19ce58a84d46de62c8d09892f006bd346330df5f99ad8f7c8e706`

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