PDF malware analysis — malicious · a0910835ea366714

MALICIOUS

PDF

123.3 KB Created: 2021-03-24 12:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: d23dc829879a6cb7d83a06086d2acf15 SHA-1: e1619b3807b64453850d9b8e05d23cc24bd015ba SHA-256: a0910835ea36671455e4393f36429ff69106a7ac810964b875f1a0f841a2fdfa

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://xajibur.ru/wix?keyword=apk+editor+pro+download+for+pc PDF link annotation
- https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/3712368.pdfIn PDF document text
- https://toromadon.weebly.com/uploads/1/3/4/5/134523466/gefurivoguwi-kuluxi-dedosonili-gubeto.pdfIn PDF document text
- https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/2463656.pdfIn PDF document text
- http://gekalam.22web.org/adobe_reader_9_free_windows_xp.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384145/normal_5ff8ae505086e.pdfIn PDF document text
- http://jedugefipevama.iblogger.org/77710040650.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4405652/normal_5fec1cc47c45c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404122/normal_605415274b2da.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://wuwiwetagu.epizy.com/taseb.pdfIn PDF document text
- https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_e37bd37de5454519b3e5933d8d36fed9.pdf?index=trueIn PDF document text
- https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ec36775b63294017b229260d4c637a94.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/fd8d47e8-7ddb-4f53-aa35-317cec788000/how_to_reboot_my_motorola_android_phone.pdfIn PDF document text
- http://buvupopeg.rf.gd/resignation_letter_sample_philippines.pdfIn PDF document text
- https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b4a411f714f44ef8bee7dfb100f040fa.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/lezopobigeza/32936310319.pdfIn PDF document text
- http://roxubimolileko.epizy.com/tibibe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f7ba51c6-4568-4011-88aa-55f505becc28/tadonivamidoledabalurolu.pdfIn PDF document text
- https://s3.amazonaws.com/xoxaneral/32851964284.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_off0000dac1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAC1	68036 bytes
SHA-256: `3d4b2291a8fd51158894eeeba91d72584bd00c944652dd22ff35a81e67586e55`
`font_01_sfnt_off0001a6c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A6C3	5116 bytes
SHA-256: `de5cc4493e960b4cedf747c9973dc0a93b24dad2e5c4bb9057c2c4805537af9b`
`font_02_sfnt_off0001b854.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B854	10772 bytes
SHA-256: `f0386a6ff17ff6e2d4a65e477578372262874b6218b74ae236cfafb747d5da35`

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