PDF malware analysis — malicious · 9f8a1be02b8c4197

MALICIOUS

PDF

73.8 KB Created: 2021-04-06 12:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 5bba51e3a37796f04e905792ac3b5eca SHA-1: 0b018ff5e2dd0a26e142ca3f1a18450177c7d340 SHA-256: 9f8a1be02b8c41974f0d271b056ffe1a9ab15522c08f5bf5f0648c9bea55c11f

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known redirectors, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/123?utm_term=handwriting+paragraph+practice+worksheets In PDF document text
- https://cdn-cms.f-static.net/uploads/4424997/normal_601185e725e8e.pdfIn PDF document text
- https://vizazifikoj.weebly.com/uploads/1/3/5/3/135327449/wovimuvigamuvuw.pdfIn PDF document text
- https://gumikixinugud.weebly.com/uploads/1/3/4/8/134864359/124bff74e7b4.pdfIn PDF document text
- https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/fuxotidavoguxelefiw.pdfIn PDF document text
- https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/5336852.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4419437/normal_5fce74b5c2496.pdfIn PDF document text
- https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/c3355b0af.pdfIn PDF document text
- http://logawedulukudan.mywebcommunity.org/beehive_english_book_class_9.pdfIn PDF document text
- https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/geluwolipu.pdfIn PDF document text
- https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/rezorule.pdfIn PDF document text
- https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/jevipo_vavuja_vuxapinuwe_lejuwomi.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4482847/normal_5feb4493970f0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4411479/normal_5fe2d184cfbf9.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://wegamaluperetuj.atwebpages.com/22368693850.pdfIn PDF document text
- https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_12963b1639f1449bb5ad6724a292be80.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/musoxifuvitalo/2792980279.pdfIn PDF document text
- https://s3.amazonaws.com/dobikasukavu/42607473726.pdfIn PDF document text
- https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_a3ca887822954b6a93a772bbe975d303.pdf?index=trueIn PDF document text
- https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_b431c76247204d9c81f1bad473f4a582.pdf?index=trueIn PDF document text
- http://litorow.myartsonline.com/how_to_reset_maintenance_light_on_highlander_2013.pdfIn PDF document text
- https://s3.amazonaws.com/sirilagewuga/sakilutuk.pdfIn PDF document text
- https://s3.amazonaws.com/tutasujal/how_to_light_a_jotul_gas_stove.pdfIn PDF document text
- https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_8622e6d4b1234502817e3a53fec9ba6d.pdf?index=trueIn 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_off0000d2e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2E7	5208 bytes
SHA-256: `8102dc2f0aefcf305427769a5b9ce2d76ea476da559d7162e65ff93aea78ce95`
`font_01_sfnt_off0000e49c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE49C	10800 bytes
SHA-256: `fe649967b5b8d26ddc62dc05c8390ea01ee8031b4cc138565ccf7392eb4c0c04`
`font_02_sfnt_off00010957.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10957	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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