PDF malware analysis — malicious · 132f33a37185a941

MALICIOUS

PDF

78.2 KB Created: 2021-02-04 05:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14

MD5: b942ca45c468c4431518ff99dc6a2f68 SHA-1: 8ccd7ef4dfe12bb4fb16c5edf6b28e41a3f49ea0 SHA-256: 132f33a37185a9414d76d6f1a3f3e13d0ce75df5e94605c0468c53d98a479deb

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The presence of a known malicious redirector URL further supports the malicious nature of this document. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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 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.
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://crophysi.ru/123?utm_term=craig+cook+padre+de+alicia+keys In PDF document text
- https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/42460.pdfIn PDF document text
- http://milanomoda-italy.site/mazda_6_2018_reviewvo57o.pdfIn PDF document text
- https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/sosiluwezawosoregi.pdfIn PDF document text
- https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/2422189.pdfIn PDF document text
- http://kyukty68.xyz/special_ops_clone_troopers3ldt8.pdfIn PDF document text
- https://cdn.sqhk.co/tejurorado/cBBjb5j/setepe.pdfIn PDF document text
- http://profaudit32.ru/xivexodoxenuruwoxivedak0whly.pdfIn PDF document text
- https://cdn.sqhk.co/sepunaro/NJUiaia/2219508213.pdfIn PDF document text
- https://cdn.sqhk.co/gujawovuk/dgccw6s/cnc_machinist_jobs_in_orlando_fl.pdfIn PDF document text
- https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/a7b483894907e.pdfIn PDF document text
- https://cdn.sqhk.co/lugizumevemu/dHMhj5F/fowotewoxitakokut.pdfIn PDF document text
- https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/86d77a510f.pdfIn PDF document text
- https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/7efd9.pdfIn PDF document text
- https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/b6eb3764.pdfIn PDF document text
- http://frut-tree.site/zefaximisigisasuzst66d.pdfIn PDF document text
- https://pememeva.weebly.com/uploads/1/3/0/8/130874233/pifazuponozenib.pdfIn PDF document text
- http://bioforcecolumbia.site/english_language_learning_books_free_downloadblg6l.pdfIn PDF document text
- http://bestgirl69.com/crested_gecko_morph_sheetwx2b6.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA11	5312 bytes
SHA-256: `d74814803c2eed4cff7ef9c2a2906944c99bc8755168f34be38aec30be1c38e9`
`font_01_sfnt_off0000fc36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC36	3720 bytes
SHA-256: `b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b`
`font_02_sfnt_off00010799.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10799	10356 bytes
SHA-256: `87729ab5d38642e30dc0fad4f15071fd4a21e0e34e2c23480f970e3296c1f124`

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