Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ae3b0887a91826…

MALICIOUS

PDF

84.2 KB Created: 2021-06-11 10:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14f93314ea99dac43dd563796014d737 SHA-1: ce72fa99e901dc5aaebecb16c8550b69516bf3c2 SHA-256: 13ae3b0887a91826e362762ae1febc488eae246441c0ffcd8b2247a8c8fff4b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://archism.ru/pbw?utm_term=au2+id+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6059ec97d8860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403676/normal_600f5b876e052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_60314db2a76c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc97a57076d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_6025aa4733f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_6053e0a31dbe6.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/57201938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427504/normal_5ff176de5bfa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_603a59954ef99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_60643ab357d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_606c951c8e1c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a86c7c637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_601934ca39a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_5fe716264a8a1.pdfIn PDF document text
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/piwanemanosi_ronota_somiruwavedujij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6068dba8b179b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/547e890c-a25b-40d1-8241-96d9f1468145/80685083184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6338952b-a1bb-4482-819e-ed0fa83bbc57/33658166386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21eb290a-1b57-42d1-8212-33f663a0bdc8/best_replacement_for_wd_media_player.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 3528 bytes
SHA-256: 1181eebf8e937562c51e6653764e6c4fd7cff00376f9c43ca69824a54c79aa03
font_01_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 4832 bytes
SHA-256: 9706ca7b7162a41419c1728c4a1886d44ea5392be99d8cb563b3cc7d7f351c68
font_02_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5852 bytes
SHA-256: 070190071500e4e782f35bfd755afae89b66324ef3097a980fd68c75fb9893f1
font_03_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 11484 bytes
SHA-256: 2c0e4f6b65e2521398686ab7e7319eaa4cf46e67191c4c1a18ce0f877d788dbb
font_04_sfnt_off00012a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16568 bytes
SHA-256: c5297101cb03db59561d884feb0d87a5e2a324c4b307e77103450d9a3d36ee43

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