PDF malware analysis — malicious · 308b263f794b3358

MALICIOUS

PDF

81.3 KB Created: 2021-05-23 23:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: d13951e41f3ee76f3ec9ea2725c4af1c SHA-1: c58339b8d745be9dab427d7dbdee19981b8119ee SHA-256: 308b263f794b335873e6dbfa76eb3e06bba401e98887d1efad56a5def35d00ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to Weebly and other free hosting services, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
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://dugedepap.ru/strik?utm_term=american+pocket+bully+weight+chart PDF link annotation
- https://punelita.weebly.com/uploads/1/3/4/6/134679726/7578098.pdfIn PDF document text
- https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/696248.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383160/normal_603f7eeed6d4d.pdfIn PDF document text
- https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/1918151.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4401972/normal_5fc7d46e7664f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422909/normal_5fe8abd92a9a5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369782/normal_5fdde2b0ac272.pdfIn PDF document text
- https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/03b977ff7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448548/normal_5fd6a68e7a9af.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481515/normal_604d368d8d6f5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415526/normal_603a5d31e796b.pdfIn PDF document text
- https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/9872075.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390374/normal_6068d5c5ee11d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/b1118329-5728-4589-8f8c-d89855266e63/3330801668.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4f4a9944-936b-4e51-8517-9c6c55f89365/lizufadanosugavezogek.pdfIn PDF document text
- https://s3.amazonaws.com/memobofilenabon/the_adventures_of_huckleberry_finn_summary_chapter_1-4.pdfIn PDF document text
- https://s3.amazonaws.com/tidigudetefumof/7642250281.pdfIn PDF document text
- https://s3.amazonaws.com/jajuzasalikirut/hsbc_global_research_report.pdfIn PDF document text
- https://s3.amazonaws.com/jevedijadiki/is_bones_on_netflix_canada.pdfIn PDF document text
- https://s3.amazonaws.com/kiwopusafize/purugatoturu.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_off0000f6f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6F0	5556 bytes
SHA-256: `f6bce95bc97438537ceb813b78209f6eb55101a6be5abeddff1e78f0985ff837`
`font_01_sfnt_off000109bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109BB	1800 bytes
SHA-256: `6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee`
`font_02_sfnt_off0001124b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1124B	10944 bytes
SHA-256: `8e0d08f16aac3dcdcfb1a9673923e0d1da2cb268fbdcac7c49ac41bbc7b874a0`

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