Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fddf8ad9cbbc011…

MALICIOUS

PDF

84.0 KB Created: 2021-03-17 14:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a69a6c83ff153de8bdf865a4810b009 SHA-1: cb85812c785e1c84f72cd39e7736597797eac1f9 SHA-256: 0fddf8ad9cbbc01133a33bbe20440b4419bfe3a98bd6888667b38b9d10a3efb7
254 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. The document contains a large number of embedded links, with a primary redirector identified as 'https://dafemum.ru/strik?utm_term=what+is+the+color+of+fearless', which points to known malicious infrastructure. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=what+is+the+color+of+fearless In PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/nomadebow.pdfIn PDF document text
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/kejadepe-lobulader.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/nisawegipow-kozeno.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/neperovirel.pdfIn PDF document text
    • https://sinosopad.weebly.com/uploads/1/3/4/8/134892142/rurebavoxed-gitozodukuji-tesomu.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/ec8953441b8bcdf.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/pobimuronunitaluwe.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/ca1220b4745ad01.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/27c11f4c-46f7-416e-91d8-ed5d14e18a19/ledafenuzopasoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3998ef22-dcf0-492e-9d33-2828ab7a198e/common_trig_integrals_and_derivatives.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/juzonuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204162c8-bf86-4138-b1df-0f7161f1532e/63293848016.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_8e693af56e7e4ec29bffbc59d7b4cbdd.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_07b346f096e040d0b6270d0fc1929dbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/593c4757-3dd6-4a44-a1be-8d67d4ea6a31/93560102842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47317e30-b398-474f-8ee5-9a8abeb96db6/maximum_ride_the_movie_2.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_1d78fc7be7954adabc334cd4c3729919.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/45205463888.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/46663807417.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/free_japanese_alphabet_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/puxegexeroseguluf.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/if_else_in_oracle_rtf_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/netbeans_php_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/dota_2_guides_not_loading.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_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 4980 bytes
SHA-256: 486afd8d348e8634123198f65fd9ca5fba0b205581d512a8b962e731f3fa9a7b
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 11564 bytes
SHA-256: 8c0e8def97c35ff4c1a27c97219791f73f7673403ebc9af9de1979be414b6bfb