Malicious PDF — malware analysis report

Static analysis result for SHA-256 c762bbf87d74ca64…

MALICIOUS

PDF

78.2 KB Created: 2020-12-25 09:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ebc84d738c578c0e00438cf6db1b6df4 SHA-1: 58f7472ad0514f44af67394a857847f6b80d4d8a SHA-256: c762bbf87d74ca64069e4069373de77773c6a153913965bc3f0961ffcd8e870c
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/aws?utm_term=quadratic+equation+solver+exact+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5f8cbd585a27d.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/bnjgJhd/4048483390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5fc0c1b36731d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc8e14f313ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410975/normal_5fe15d692babd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5f93b99b71bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5fb85fe6a30b3.pdfIn PDF document text
    • https://cdn.sqhk.co/maxolavoweje/icihQNn/tubidy_free_download_mp3_mp4.pdfIn PDF document text
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/51e5d6523528eab.pdfIn PDF document text
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/suxomax-bavopageto-moxuxagakot-mirupavadu.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/63a53b98-44a2-466e-a72a-25d1456ca960/eimacs_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa0d8f4-029b-4f88-a7a0-9b8f11c92cbe/42950451222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9ee318-f245-4c4f-a5cb-ad9aee0fea15/market_vs_limit_stock_purchase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48db2b14-d142-43ac-b58a-7b2868f8d487/allahabad_high_court_ro_aro_paper_pd.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5220 bytes
SHA-256: 1d50fefdcf0a8372fcd34cca6250151ce48d2901afc6fe7a0684fd6ee4ddb965
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 10860 bytes
SHA-256: c83e306954251642ba00b3a51fd7916e0f3780dee685c2df81e21052941eab6b
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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