Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13d492109febbf8…

MALICIOUS

PDF

72.0 KB Created: 2020-11-09 20:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5b605bca91cd539418ed3b08c2c8db8 SHA-1: b0c8fe2104f4337c76f7494de6dbefc9e938a1fe SHA-256: a13d492109febbf800087a17ea0a75ab692113ae05698e9ef003c09c2978e6b1
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links and heuristics indicate it is a malicious redirector and part of an SEO link farm. The primary redirector URL is 'https://ggtraff.ru/123?keyword=scientific+notation+worksheet+free'. The document body is heavily obfuscated, but the presence of links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/123?keyword=scientific+notation+worksheet+free In PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/potiterel-jijizad.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/e87064dedf6ddb.pdfIn PDF document text
    • https://jubozofarubowi.weebly.com/uploads/1/3/4/0/134095851/6129086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f9e0b54b716f.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/pijuvanab-mojisi-nazogidaxudu-rozumano.pdfIn PDF document text
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/880895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e625af-123d-40ed-a55e-bcfb1eacad75/tropico_5_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2a930a-bd31-46a7-af14-3047315f1f7f/furusopegewotixotepolif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef2a583-348c-4baf-8100-c1a9ad1008b2/42470969571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfdbc64-20aa-4f86-b21f-c9e358006bf9/dafimusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d98937-c754-4083-8356-e0033e888305/81759404872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa89889-bc39-43cd-b9eb-297ad3ee3da1/17483216547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a99155-a793-4a79-9ca4-910dac8b95f6/rozemibova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a319624-4d1c-4447-966d-173732989a95/unix_network_programming_by_w_richard_stevens.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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 5196 bytes
SHA-256: 5889a514845becebe01bd7856def1772acda5ce4f7acc07a04b6508969662513
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 11668 bytes
SHA-256: 6d65b9dae8bc3259ab72986fe5d5ef55230f0e66a8174449ae6e9b6bddca49ff

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