Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c70b39a26f12e99…

MALICIOUS

PDF

76.0 KB Created: 2021-01-22 16:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d735f49d010dfcba4d4b8ecb43219952 SHA-1: 95f7545d65a5e4903d945206b12b4b15652a17d5 SHA-256: 7c70b39a26f12e99fc6b1eb1905ed3299c4fe93f828d3b7a2894550861a0f602
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate a likely attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafftec.ru/123?utm_term=brother+p+touch+label+maker+manual+pt-d210 PDF link annotation
    • https://cdn.sqhk.co/xawodoze/hdjjibj/25835835298.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/3249008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fcefa7765670.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/mikeritan-wuniwibitipaw-zoliba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe10e2482542.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/guzadegepixewopulon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_600802f213d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64a20a2a2a.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/8cf5aebc94d765a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fc8043a783eb.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/45c9a657fce5.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/pujujaku_rewab_felopewupi_bofumuxorerab.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/seselitavus.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/jemisajoda/bufagivuwojamerov.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/22361709937.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/pivilaso.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.

FilenameKindSourceSize
font_00_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5748 bytes
SHA-256: ac9ae8b81d65bd2a99b23e1467328756ffff241c131d19c087e5f5e8acd67c13
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 11180 bytes
SHA-256: 73bb97795a61e32621c220c2e13b240793c9282073366c627e4cd69c56fcc69e

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