Malicious PDF — malware analysis report

Static analysis result for SHA-256 304855025e5ed02a…

MALICIOUS

PDF

73.9 KB Created: 2021-01-15 08:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ddb83c0d8a239e4ab4d074d2f481083 SHA-1: e8173f1b65c609abd3452ecd8ccedff853f8c381 SHA-256: 304855025e5ed02a2210683654307181fa58d29510f9deaf099f9e55798e7d67
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to redirectors and SEO link farms, indicating a phishing or malware distribution campaign. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest malicious intent. The ML classifier also flagged the document with high confidence. No scripts were extracted, but the document's structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/123?utm_term=daily+journal+franklin+indiana In PDF document text
    • https://cdn.sqhk.co/sebixodof/cjghau2/sataza.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/hfieAij/wisovufokapasaba.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/gegciaJ/60164555642.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/hcidm4y/kpop_groups_list_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/XzZbEoP/android_fm_tuner_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5fbd1520d8b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_5fe840bd70ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/DXmjarw/futakokadunubumu.pdfIn PDF document text
    • https://site-1171523.mozfiles.com/files/1171523/baidu_hotspot_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fcc3b7f56e3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fffe9eeecc19.pdfIn PDF document text
    • https://vudizexifaret.weebly.com/uploads/1/3/4/3/134314381/robafegunokuvurevuzi.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/rakamo_xawewamamokotop_zojizopev.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/9uz5LaZ/92573180323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5fa1035f194b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 4964 bytes
SHA-256: 781e6448e6f76d53d88cc350e01e6129087d39cec9832f378d9107df8ec8c35f
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 11592 bytes
SHA-256: 50f4c2f131bbe0dfe2597e844dcb755bc5ef820f8bb194d7871fc7b89bef28fb

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