Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f566ab469d53990…

MALICIOUS

PDF

79.9 KB Created: 2021-06-01 03:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f9d12cd1ef17ff1afaeabbf55d75f57 SHA-1: bcfee832c0226a0b3a6d93c20758caf6593c76c0 SHA-256: 4f566ab469d53990b5aca8c4386b27697dc9d55caee1b303144a9570a2d9d009
186 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. The document body and extracted URLs suggest a lure related to "hacking" for a game, directing users to a link farm of other PDFs hosted on disposable domains. This pattern is consistent with SEO manipulation or phishing campaigns designed to drive traffic or potentially host further malicious content.

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
  • 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.
  • 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://catamma.ru/pbw?utm_term=how+to+hack+standoff+2+money PDF link annotation
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/7610858.pdfIn PDF document text
    • https://letitelow.weebly.com/uploads/1/3/4/5/134500939/vasitode-mamutuxata-gexemu.pdfIn PDF document text
    • https://ratexema.weebly.com/uploads/1/3/4/7/134720574/520934.pdfIn PDF document text
    • https://subuwufokizewe.weebly.com/uploads/1/3/4/8/134854038/3881643.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/9625323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fcecccfbb59d.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/6639304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_604e56adc54b3.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/783476c3.pdfIn PDF document text
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/wegopemirom.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
    • https://uploads.strikinglycdn.com/files/53997890-6151-47b9-ba95-c68390764a6a/difference_between_1956_and_1973_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3bd5c7-8baa-4b79-b071-19831e179f81/23407228824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5918a0-ffd1-4c88-a3aa-b898a05da0ab/netgear_gs116na_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abff72c2-63cc-4615-bd44-dcede60b407b/sivuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d397037-747d-4116-9e90-64f242e8a99a/datefob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3317872-9e60-41fd-b2bd-2198abd9fb96/putulamaxonopirela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd62183-4119-425b-a75a-223d81362167/69594218775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072584e5-3184-4ce7-97ad-a2661d4dd154/finixas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620ce31b-f427-4601-8f8a-b5c10d7f626e/82013551991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a088bfdc-4a03-443b-b1f1-f10f758df54c/the_black_company_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bebc77-aa5d-440f-9774-7823301a5fb4/ripuvonurut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f983e0e-05ef-483f-8e6d-eeacc37f016d/what_is_contract_employment_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459e3f85-f0f2-41d3-b104-46b6ad2aea8d/greatest_salesman_book.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.

FilenameKindSourceSize
font_00_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5224 bytes
SHA-256: dfbe2eb1ce4eec75c1160abc8b387f42d088d1992510323669506c9688e6dcc9
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 11624 bytes
SHA-256: b7fe5dfc2ada955bd5711720a3fcb675966ef8c55219c3cb4cd1a198b31ee7b7
font_02_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176