Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9c43693de5077…

MALICIOUS

PDF

105.8 KB Created: 2021-04-07 03:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 64c0e6fade05c38bfc7dec938fdfc059 SHA-1: 5b99fcf8c3f8e634a6c406d94136938204c88227 SHA-256: e1b9c43693de507793edafbd18bbc091617d165d6372ce00bf34e9b4fa3043df
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. One critical heuristic specifically flags a link to `crophysi.ru` as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=attack+on+titan+season+3+recap+movie In PDF document text
    • https://lexeparuma.weebly.com/uploads/1/3/1/3/131380616/4417182.pdfIn PDF document text
    • http://indonesia2health.online/sodalavuvakaxadizoxefatid1lzcm.pdfIn PDF document text
    • http://dontbeshy.xyz/nizetowekudogafra1f4.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/bb76dae.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/wanel-ridez-zigutiwo.pdfIn PDF document text
    • http://boost-shop.xyz/cat_fish_farming_in_nigeriaf4e2s.pdfIn PDF document text
    • http://damvglaz6.xyz/86207099422bqx8l.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/49693817525rc44v.pdfIn PDF document text
    • http://mscgis.net/tosudago5xjrx.pdfIn PDF document text
    • http://milanbeachs.space/3591496487699vgi.pdfIn PDF document text
    • http://ventager.online/fruits_and_vegetable_coloring_book_for_kids-vy972.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/d897a.pdfIn PDF document text
    • http://mandarins.space/makur42vbj.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/69e0b2cb-1c40-42bc-a9d4-f596d296fc47/58278232258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cc8d50-d189-4a92-8d76-858c31f7a84b/magitidekoviramizuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df8f441-38ff-40af-84fb-d78912fdae6e/7499475195.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/31052925638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619a55df-1680-4dd5-a56f-d8f0337788ee/padukovulizagegetovem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b92726-d2f9-4346-815f-4464898fd631/tibetan_dream_yoga_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/how_to_change_code_on_hunter_fan_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97deca8e-56d0-4f76-bfb5-16767d5af5c3/saxon_math_homeschool_8_7_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf852f0-e7cc-4939-9b0b-f9086900f056/wedetibebeteduki.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/how_to_adjust_bobbin_tension_on_brother.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/ielts_listening_practice_test_with_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f0c9b7-438d-419b-b6fa-0185d651d549/23939751524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc283c05-048e-4d6f-a171-cb5282780bfd/roland_d50_best_patches.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/samsung_hw-e450_firmware.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 35520 bytes
SHA-256: 512c3768aba9d119cf4b2cf1846edbb26b7639d932b1f3bbca0017783bf88070
font_01_sfnt_off00015f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F04 5324 bytes
SHA-256: 97b1a1a146f2af17e2c88ddbfcca5c9a0a956e6b1450b4a224f697c5d26cc0b3
font_02_sfnt_off00017113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17113 12088 bytes
SHA-256: 9ad9c122814b1bba88d4df83b027539b8090ef2ed451cbc9fc70bfcf5d2c93de