PDF malware analysis — malicious · f9930eb0110bbaa3

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 23:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: b0997da2dc100f16bca83afbe946011b SHA-1: e040aff1e332bdb4fb3d2b08037ad1e9ae28c06b SHA-256: f9930eb0110bbaa3a973af2f1a8c882cbfb3d113ce8db21c23fc3a6325c338ce

206 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many of which point to other PDF files. The heuristic 'PDF_SEO_LINK_FARM' suggests a deliberate attempt to create a large number of links, potentially for SEO manipulation or to distribute malware. While no scripts were extracted, the presence of many external links and the overall detection suggest it's part of a larger malicious distribution chain.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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/123?utm_term=search+by+image+mobile+android PDF link annotation
- http://websporizle3.com/what_does_the_bible_say_about_feeling_unlovedb6s8u.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469847/normal_5fd10c8fae6a3.pdfIn PDF document text
- https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/97779843.pdfIn PDF document text
- http://igbusinessabouthelp.com/52204932144uepov.pdfIn PDF document text
- https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/7759398.pdfIn PDF document text
- https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/jajijovegix.pdfIn PDF document text
- https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/difezogif_puxebaxejaso_pirol_lokew.pdfIn PDF document text
- http://itgermany.net/how_to_get_a_job_as_a_software_developerefwf9.pdfIn PDF document text
- https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/5057845.pdfIn PDF document text
- https://fiketizi.weebly.com/uploads/1/3/5/3/135387405/lipogolab-nerovun-kevot-xumudivetow.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413111/normal_604f2c447e200.pdfIn PDF document text
- https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/666ae3d181.pdfIn PDF document text
- https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/8914022.pdfIn PDF document text
- http://rotixumuzu.22web.org/67637428806.pdfIn PDF document text
- http://scarcebook.com/lefodifamomilezoxuju3i2rh.pdfIn PDF document text
- https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/revobogipemige_durebusazalafit_lipobi.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/nokiva/90111910322.pdfIn PDF document text
- https://s3.amazonaws.com/mipizaju/rorotezarofiv.pdfIn PDF document text
- https://s3.amazonaws.com/fizufapu/wogalub.pdfIn PDF document text
- http://viladanus.epizy.com/7705013857.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECDC	5520 bytes
SHA-256: `de3211e102dfff1a2070bc1decdd45536eb779fcd9d9d884a4f8cdc6790bed93`
`font_01_sfnt_off0000ff7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF7B	10936 bytes
SHA-256: `6c8909ff4e20ecac6727e00f2c03c05073daaf71acb942a18adf78c08663a9ce`

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