Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4ce513e1807d73…

MALICIOUS

PDF

63.3 KB Created: 2020-12-19 19:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ef2886f91611deb93188d78ae973b2ef SHA-1: 96d4f513ff2fe576f395eebf578ad2ef4826e600 SHA-256: 5f4ce513e1807d73c73d3e99552973be050c866f6d56fab13a385adaaebf75e5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a malicious redirector link farm. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

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=maximum+sheets+of+paper+per+stamp In PDF document text
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/mamelapinadubinuvivo.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/2242812.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/bokexizometun/xefelem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67358116eb00e3c721a77/t/5fd1544582964746ec8c23f2/1607554117832/natural_food_and_supplement_store_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2594324d-e681-46e2-abe4-23767efedc42/sankarea_episode_15.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d88a504bb4653ce18603/t/5fd18696ad61ab5831830453/1607567000345/how_to_sell_facebook_ads_to_local_businesses.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/81049260266.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/ascharyachakit_netflix_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2daa34-8754-4b12-b7f5-061da92e5b39/64673660588.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/lizikimibeji.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/29554444883.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/kilimanjaro_climb_guides.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_off0000bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC23 5184 bytes
SHA-256: 73456f3634c3c1d5c680a9523f0d2a8eac858c0d17ba1b89cab73d3c73f998d4
font_01_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 10224 bytes
SHA-256: 26b59f5c3697cb62807edc888ebedef0669057b8d57150d6cd217f6137c3360d

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