Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6ca7c955c5c791…

MALICIOUS

PDF

106.9 KB Created: 2020-12-07 14:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5c2d1e4a9346a555f00e3b514c6f364d SHA-1: d795f44d17146fefad874edf4edee342645797b2 SHA-256: ac6ca7c955c5c791b65a0093e501158e58923407d346232ae29559541c5d8815
214 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/123?utm_term=philips+respironics+remstar+heated+humidifier+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f95b6e754082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_5f9e11d871bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5fa35aa31e91a.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/lirej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5fc8bac831a95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ea399e-ead6-4b39-82c6-8f177bcfc5d2/reponaroro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790dbea7-c12e-4ad9-8c87-b83b0904f286/wujovafojomepadonirimugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8935506c-22ce-4e2d-9d8e-d44e584e9279/sezisowetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd927354-00b9-4c78-a16c-15365c8a6a78/53482556878.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/laxirenozibamef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0249af-4292-40b0-84c0-a7803ce21dc1/98472946331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9fe088-cc16-44da-972c-681854564ed0/37968918575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14b0d88-f56a-48fc-bad7-3a8ef88b9d03/pidofo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000154cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x154CF 17672 bytes
SHA-256: b4b09e73f8b849a10922a45c83615ca909a532add93f27911fa53a8c079f6d01
font_00_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 2888 bytes
SHA-256: 78885e247b1e7efa683895f67bcb90bf022b72a1a9e3ebb6f11a578be93ecb94
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 5396 bytes
SHA-256: 2e25ce798eca24ab1ad6f367ae3317bc73725582c6bff3edb08c3c403008d06f
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_03_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 11364 bytes
SHA-256: ef135a9fcba78e8c289592069c9d60b2bb55a3175f4d1a65ac2e8bc6336dfe56
font_05_sfnt_off00017023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17023 15216 bytes
SHA-256: 090b345feba893dae14f51b658f40dcef109b223ecd6640beb1ecdcdefa015dd