PDF malware analysis — malicious · 83df2e363db24cea

MALICIOUS

PDF

75.7 KB Created: 2021-02-11 07:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 18a2b4bdd9b4565574a18224525b2717 SHA-1: 4c7d81d4b20219e29bdba7f958312b1ef8284ce3 SHA-256: 83df2e363db24cea47cf3203e36fc16e54aa4eac06dbb22397e825c3df4efe4e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, possibly leveraging JavaScript for execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://bologen.ru/wb?keyword=bootstrap%20responsive%20one%20page%20template%20free PDF link annotation
- http://difewemizotik.iblogger.org/jemenukuvaxemominabujelid.pdfIn PDF document text
- https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/2069ede3.pdfIn PDF document text
- https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/fagifozedamukes_palar.pdfIn PDF document text
- https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/76328.pdfIn PDF document text
- https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/fomanugubiridi-rimas.pdfIn PDF document text
- https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/vitoratid.pdfIn PDF document text
- https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/vujabuzitusira-xexutuwuse-jofijixuzuwovej-burujobojog.pdfIn PDF document text
- https://wawizaliw.weebly.com/uploads/1/3/3/9/133986908/putaxofijodezumafovo.pdfIn PDF document text
- https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/xezos.pdfIn PDF document text
- https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/319590.pdfIn PDF document text
- http://muzidos.iblogger.org/barbie_video_songs_in_tamil.pdfIn PDF document text
- https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/0210c1e859e.pdfIn PDF document text
- https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/rusidawiro-fisevamut-koviko.pdfIn PDF document text
- https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/degelav.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://kuzezoma.epizy.com/free_psychometric_personality_test_questions_and_answers.pdfIn PDF document text
- http://zakefozufasedi.epizy.com/jijomowexibesate.pdfIn PDF document text
- http://moxododokojuke.epizy.com/o_que_e_paroxismos_epileptiformes.pdfIn PDF document text
- http://zamonile.epizy.com/akshay_kumar_song.pdfIn PDF document text
- http://jesegusanasukan.epizy.com/counting_by_5_s_worksheets_to_100.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFBA	5116 bytes
SHA-256: `1c3147d8cfbe8ae040ae595b6d139fbf9ae4467980ed206d1b85b0ff70a2029a`
`font_01_sfnt_off0000f10e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF10E	10028 bytes
SHA-256: `7af577fecd981144ff168826975171294b8958b2f482b2d85dfc486295ee56d3`
`font_02_sfnt_off00011364.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11364	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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