Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdde4ff00962f9bf…

MALICIOUS

PDF

116.7 KB Created: 2021-04-01 14:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c714d7112b2b1e7729f07d8fa1480d39 SHA-1: 9e335df19ee0727b88152ddcba7d7d8d620327dd SHA-256: fdde4ff00962f9bfa1770c06758420890a69424e3d04b1761f22260d06392dde
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/wix?keyword=troy+bilt+13at609g766+super+bronco+manual In PDF document text
    • http://bapadama.medianewsonline.com/casse_tete_chinois.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/jhijsWK/miwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tozakexidupe/ighnhT9/open_cloze_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/hiheic9/linear_algebra_zero_vector_dimension.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/the_ministry_of_utmost_happiness_by_arundhati_roy.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/hcF6hfd/order_3d_printed_metal_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/hP2w4jc/xelomivavegobox.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/hihbjh9/dulasokowatofetija.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/bXjjgje/nufajip.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/how_to_watch_global_news_on_apple_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/sinusoidal_regression_worksheet.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_5413348d1767476caf5a365d47daf1a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/98331092933.pdfIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/el_dulce_dao_alfonsina_storni.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_0fd8f1119bb74c6591cf9eb9230c9669.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_a705f9f488d74586890d62d9df0ba209.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_b687d162848e41319fd60b66dfae9189.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_306f9de48e0b422ca580c2364a87216d.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_a17518e9763a4b10a41a87339ddeb722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazolu/67555400434.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_8f8ed7cadce042a486b772c5aa9b2ff6.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f557bd7deec647e09804949e8a33ce60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/mountain_america_promo_code.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/jegixo.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/pujixusitulugawijezef.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_off000179cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CD 6072 bytes
SHA-256: e0c0efe3b25e71c8d6b56246120811c8b262e1dbc1aa5eaaca4950bf6f0c6b3d
font_01_sfnt_off00018e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E67 11276 bytes
SHA-256: 2f0ae8be5402419a39ed44cb773084a7eabf51ca0d01b5c7ee3c661bf6ec121e
font_02_sfnt_off0001b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f