Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a78153eb51797f…

MALICIOUS

PDF

78.6 KB Created: 2021-05-20 23:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8184566db1d8615511dac47a5f2e5ede SHA-1: b30dfce7bf8402e17c38b9bb51feac77a8b44a35 SHA-256: 92a78153eb51797f78dbd147b3b49be41121e52be3d2857911b858baa4bda6a7
254 Risk Score

Malware Insights

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

This PDF file contains a link farm and redirects to a malicious URL, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to a compromised site, likely for credential harvesting or malware distribution.

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://yafferge.ru/strik?utm_term=pcos+weight+loss+workout+plan In PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/werexigi.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/6860138.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/vuzapebukezen.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/wezejemaxopu.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/coso_framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35fa994-81a6-486d-9ae4-892c280b3804/9999528600.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/damned_human_race_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a800e6f0-e88d-462e-a34d-db1b9245244e/que_tipos_de_razas_humanas_hay_en_el_mundo.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/zejekidibupupanafazimodu.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/the_cross_and_the_switchblade_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/9484994904.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/sosunonalag.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/busken_bakery_sheet_cakes.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/81478927438.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/cello_songs_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/9877564610.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/crazy_little_thing_called_love_movie_review.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_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 5352 bytes
SHA-256: 70147cb47033a6b11980deb57e640aa2448e8e330712cec8547530611dd416df
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10816 bytes
SHA-256: 70762362140bebd1612418eca08f5836347f1b08f023337f68ba3c6f07468719