Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6cd9df14ee4430…

MALICIOUS

PDF

64.5 KB Created: 2020-11-07 01:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 576b0613e3d4fad10c7f777f87ff1408 SHA-1: 108563f234eae9580fe7a9deb66a698b453cbf65 SHA-256: 9b6cd9df14ee443012b559bc1b96d2359f1d43325627773bfb9b9f49ef035f2c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/aws?keyword=7th+grade+girls+basketball+practice PDF link annotation
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/9249183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f8eddaa57c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fa5d63635930.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/b313c439f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_5f9fde849e7ca.pdfIn PDF document text
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/fuwizozijogiw_pibage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87074e82f10.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/78a11658-63c0-46e9-8934-e4b7d8368998/delonghi_pac_a140e_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b812eb5-49c4-4e89-9806-3037d206f47a/60504670608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa001b39-9db1-44ff-98ed-e7a0d65d1f49/98909578654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995f38e3-8fe6-4ac7-b899-aebb2eb3f383/3798721563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d7929f-183c-47c5-84ef-a856371fbb58/modern_principles_of_microeconomics_4th.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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 5096 bytes
SHA-256: 33b6fba49ca21f95c33ae657538b21788d46bc36f92aae96745b77eff72dbad9
font_01_sfnt_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 11124 bytes
SHA-256: f0cb63c11eb750bf31599dec44c5a87c169f01bea65d3dd421b39b74b61dd654
font_02_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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